Details of the Researcher

PHOTO

Kazunori Nakayama
Section
Graduate School of Science
Job title
Associate Professor
e-Rad No.
90596652

Research History 3

  • 2021/10 - Present
    東北大学大学院 理学研究科 物理学専攻　准教授

  • 2011/04 - 2021/09
    東京大学大学院 理学系研究科 物理学専攻　助教

  • 2010/04 - 2011/03
    高エネルギー加速器研究機構 素粒子原子核研究所　特任助教

Education 2

  • 東京大学大学院　理学系研究科　物理学専攻 博士課程

    2007/04 - 2010/03

  • 東京大学大学院　理学系研究科　物理学専攻 修士課程

    2005/04 - 2007/03

Research Interests 4

  • 素粒子現象論

  • インフレーション

  • ダークマター

  • 初期宇宙論

Research Areas 1

  • Natural sciences / Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics /

Papers 186

  1. High frequency spectrum of primordial gravitational waves

    Kamil Mudrunka, Kazunori Nakayama

    Journal of Cosmology and Astroparticle Physics　2026/06/01

    DOI： 10.1088/1475-7516/2026/06/050 　

  2. Detecting Dark Matter Using Optically Trapped Rydberg Atom Tweezer Arrays

    So Chigusa, Taiyo Kasamaki, Toshi Kusano, Takeo Moroi, Kazunori Nakayama, Naoya Ozawa, Yoshiro Takahashi, Atsuhiro Umemoto, Amar Vutha

    Physical Review Letters　2026/04/14

    DOI： 10.1103/s41f-6nw2 　

  3. Gravitational decays of secluded scalars and graviton dark radiation

    Kazunori Nakayama, Fuminobu Takahashi, Juntaro Wada

    Physical Review D　2026/03/06

    DOI： 10.1103/bqm7-479z 　

  4. Dynamical prevention of topological defect formation

    Junseok Lee, Kai Murai, Kazunori Nakayama, Fuminobu Takahashi

    Journal of High Energy Physics　2026/03/02

    DOI： 10.1007/JHEP03(2026)005 　

  5. Reheating with thermal dissipation and primordial gravitational waves

    Kazuma Minami, Kyohei Mukaida, Kazunori Nakayama

    Journal of Cosmology and Astroparticle Physics　2026/03/01

    DOI： 10.1088/1475-7516/2026/03/016 　

  6. Light dark matter detection with sub-eV transition-edge sensors

    Muping Chen, Volodymyr Takhistov, Kazunori Nakayama, Kaori Hattori

    Physical Review D　2026/02/05

    DOI： 10.1103/74pr-jb4t 　

  7. Inflation with Gauss-Bonnet correction: beyond slow-roll

    Kamil Mudruňka, Kazunori Nakayama

    Journal of Cosmology and Astroparticle Physics　2026/02/01

    DOI： 10.1088/1475-7516/2026/02/070 　

  8. Domain walls in Nelson-Barr axion model

    Murai, Kai, Nakayama, Kazunori

    JHEP　09　099-099　2025/09/11

    DOI： 10.1007/JHEP09(2025)099 　

  9. PQ-ball and its real scalar analogue in an expanding universe

    Kazunori Nakayama, Masaki Yamada

    Journal of Cosmology and Astroparticle Physics　2025/09/01

    DOI： 10.1088/1475-7516/2025/09/082 　

  10. Decay rate of PQ-ball

    Jin Kobayashi, Kazunori Nakayama, Masaki Yamada

    Journal of Cosmology and Astroparticle Physics　2025/07/01

    DOI： 10.1088/1475-7516/2025/07/057 　

  11. Entanglement-enhanced ac magnetometry in the presence of Markovian noise

    Sichanugrist, Thanaporn, Hajime Fukuda, Moroi, Takeo, Kazunori Nakayama, So Chigusa, Norikazu Mizuochi, Hazumi, Masashi, Matsuzaki, Yuichiro

    Phys.Rev.A　111　(4)　042605-042605　2025/04/07

    DOI： 10.1103/PhysRevA.111.042605 　

  12. Nuclear spin metrology with nitrogen vacancy center in diamond for axion dark matter detection

    So Chigusa, Masashi Hazumi, Ernst Herbschleb, Yuichiro Matsuzaki, Norikazu Mizuochi, Kazunori Nakayama

    Phys.Rev.D　111　(7)　075028-075028　2025/04/01

    DOI： 10.1103/PhysRevD.111.075028 　

  13. Dual gravitational wave signatures of instant preheating

    Wei-Yu Hu, Kazunori Nakayama, Volodymyr Takhistov, Yong Tang

    JCAP　01　029-029　2025/01/09

    DOI： 10.1088/1475-7516/2025/01/029 　

  14. Robust sensing via the standard deviation with a quantum sensor

    E. D. Herbschleb, S. Chigusa, R. Kawase, H. Kawashima, M. Hazumi, K. Nakayama, N. Mizuochi

    APL Quantum　2024/12/01

    DOI： 10.1063/5.0223678 　

  15. Revisiting the minimal Nelson-Barr model

    Kai Murai, Kazunori Nakayama

    Journal of High Energy Physics　2024/11/15

    DOI： 10.1007/JHEP11(2024)098 　

  16. Gravitational wave probe of Planck-scale physics after inflation

    Hu, Weiyu, Nakayama, Kazunori, Takhistov, Volodymyr, Tang, Yong

    Phys.Lett.B　856　138958-138958　2024/08/16

    DOI： 10.1016/j.physletb.2024.138958 　

  17. Effects of gravitational particle production on Higgs portal dark matter

    Soichiro Izumine, Kazunori Nakayama

    Journal of Cosmology and Astroparticle Physics　08　002-002　2024/08/01

    DOI： 10.1088/1475-7516/2024/08/002 　

  18. Probing Gauss-Bonnet-corrected inflation with gravitational waves

    Kamil Mudrunka, Kazunori Nakayama

    Journal of Cosmology and Astroparticle Physics　05　069-069　2024/05/01

    DOI： 10.1088/1475-7516/2024/05/069 　

  19. Misalignment production of vector boson dark matter from axion-SU(2) inflation

    Tomohiro Fujita, Kai Murai, Kazunori Nakayama, Wen Yin

    Journal of Cosmology and Astroparticle Physics　2024　(04)　007-007　2024/04/01

    Publisher: IOP Publishing

    DOI： 10.1088/1475-7516/2024/04/007 　

    eISSN： 1475-7516

    More details Close

    Abstract We present a new mechanism to generate a coherently oscillating dark vector field from axion-SU(2) gauge field dynamics during inflation. The SU(2) gauge field acquires a nonzero background sourced by an axion during inflation, and it acquires a mass through spontaneous symmetry breaking after inflation. We find that the coherent oscillation of the dark vector field can account for dark matter in the mass range of 10-13 – 1 eV in a minimal setup. In a more involved scenario, the range can be wider down to the fuzzy dark matter region. One of the dark vector fields can be identified as the dark photon, in which case this mechanism evades the notorious constraints for isocurvature perturbation, statistical anisotropy, and the absence of ghosts that exist in the usual misalignment production scenarios. Phenomenological implications are discussed.

  20. Probing high frequency gravitational waves with pulsars

    Asuka Ito, Kazunori Kohri, Kazunori Nakayama

    Physical Review D　109　(6)　063026-063026　2024/03/21

    DOI： 10.1103/PhysRevD.109.063026 　

  21. Gravitational Wave Search through Electromagnetic Telescopes

    Asuka Ito, Kazunori Kohri, Kazunori Nakayama

    Progress of Theoretical and Experimental Physics　2024　(2)　2024/02/07

    DOI： 10.1093/ptep/ptae004 　

  22. Effects of finite material size on axion-magnon conversion

    So Chigusa, Ito, Asuka, Nakayama, Kazunori, Takhistov, Volodymyr

    JHEP　01　185-185　2024/01/30

    DOI： 10.1007/JHEP01(2024)185 　

  23. Dark matter detection using nuclear magnetization in magnet with hyperfine interaction

    Chigusa, So, Moroi, Takeo, Nakayama, Kazunori, THANAPORN SICHANUGRIST

    Phys.Rev.D　108　(9)　095007-095007　2023/11/01

    DOI： 10.1103/PhysRevD.108.095007 　

  24. Nanohertz gravitational waves from cosmic strings and dark photon dark matter

    Naoya Kitajima, Kazunori Nakayama

    Physics Letters B　846　138213-138213　2023/11

    Publisher: Elsevier BV

    DOI： 10.1016/j.physletb.2023.138213 　

    ISSN： 0370-2693

  25. Quantum decay of scalar and vector boson stars and oscillons into gravitons

    Nakayama, Kazunori, Takahashi, Fuminobu, Yamada, Masaki

    JCAP　08　058-058　2023/08/22

    DOI： 10.1088/1475-7516/2023/08/058 　

  26. Dark photon dark matter from cosmic strings and gravitational wave background

    Kitajima, Naoya, Nakayama, Kazunori

    JHEP　08　068-068　2023/08/14

    DOI： 10.1007/JHEP08(2023)068 　

  27. Zero Casimir force in axion electrodynamics and the search for a new force

    Yohei Ema, Masashi Hazumi, Hideo Iizuka, Kyohei Mukaida, Kazunori Nakayama

    Physical Review D　108　(1)　016009-016009　2023/07/17

    DOI： 10.1103/PhysRevD.108.016009 　

  28. Viable vector coherent oscillation dark matter

    Kitajima, Naoya, Nakayama, Kazunori

    JCAP　07　014-014　2023/07/05

    DOI： 10.1088/1475-7516/2023/07/014 　

  29. Light Dark Matter Search with Nitrogen-Vacancy Centers in Diamonds

    Chigusa, So, Hazumi, Masashi, Herbschleb, Ernst David, Mizuochi, Norikazu, Nakayama, Kazunori

    2023/02

  30. Anisotropic cosmic optical background bound for decaying dark matter in light of the LORRI anomaly

    Nakayama, Kazunori, Yin, Wen

    Phys.Rev.D　106　(10)　103505-103505　2022/11/09

    Publisher: American Physical Society (APS)

    DOI： 10.1103/PhysRevD.106.103505 　

    ISSN： 2470-0010

    eISSN： 2470-0029

  31. Instability of the electroweak vacuum in Starobinsky inflation

    Qiang Li, Moroi, Takeo, Nakayama, Kazunori, Wen Yin

    JHEP　09　(9)　102-102　2022/09/14

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1007/JHEP09(2022)102 　

    eISSN： 1029-8479

    More details Close

    Abstract We study the stability of the electroweak vacuum during and after the Starobinky inflation, assuming the existence of the non-minimal Higgs coupling to the Ricci scalar. In the Starobinsky inflation, there exists R2 term (with R being the Ricci scalar), which modifies the evolution equation of the Higgs field. We consider the case that the non-minimal coupling is sizable so that the quantum fluctuation of the Higgs field is suppressed and that the Higgs amplitude is settled near the origin during the inflation. In such a case, the Higgs amplitude may be amplified in the preheating epoch after inflation because of the parametric resonance due to the non-minimal coupling. We perform a detailed analysis of the evolution of the Higgs field in the preheating epoch by a numerical lattice simulation and derive an upper bound on the non-minimal coupling constant ξ in order to realize the electroweak vacuum in the present universe. We find that the upper bound on ξ in the Starobinsky inflation model is more stringent than that in conventional inflation models without the R2 term.

  32. Scalar field couplings to quadratic curvature and decay into gravitons

    Ema, Yohei, Mukaida, Kyohei, Nakayama, Kazunori

    JHEP　05　087-087　2022/05/13

    DOI： 10.1007/JHEP05(2022)087 　

  33. Electric current on surface of a metal/superconductor in axion/hidden-photon background

    Kishimoto, Yasuhiro, Nakayama, Kazunori

    Phys.Lett.B　827　136950-136950　2022/04/10

    DOI： 10.1016/j.physletb.2022.136950 　

  34. Constraints on small-scale primordial density fluctuation from cosmic microwave background through dark matter annihilation

    Kawasaki, Masahiro, Nakatsuka, Hiromasa, Nakayama, Kazunori

    JCAP　03　(03)　061-061　2022/03/30

    DOI： 10.1088/1475-7516/2022/03/061 　

  35. Revisiting CMB constraints on dark matter annihilation

    Kawasaki, Masahiro, Nakatsuka, Hiromasa, Nakayama, Kazunori, Sekiguchi, Toyokazu

    JCAP　12　(12)　015-015　2021/12/06

    DOI： 10.1088/1475-7516/2021/12/015 　

  36. Hidden photon and axion dark matter from symmetry breaking

    Nakayama, Kazunori, Yin, Wen

    JHEP　10　026-026　2021/10/04

    DOI： 10.1007/JHEP10(2021)026 　

  37. Hidden dark matter from Starobinsky inflation

    Li, Qiang, Moroi, Takeo, Nakayama, Kazunori, Yin, Wen

    JHEP　09　179-179　2021/09/27

    DOI： 10.1007/JHEP09(2021)179 　

  38. Axion/hidden-photon dark matter conversion into condensed matter axion

    So Chigusa, Moroi, Takeo, Nakayama, Kazunori

    JHEP　08　074-074　2021/08/16

    DOI： 10.1007/JHEP08(2021)074 　

  39. Preheating from target space curvature and unitarity violation: Analysis in field space

    Ema, Yohei, Jinno, Ryusuke, Nakayama, Kazunori, van de Vis, Jorinde

    Phys.Rev.D　103　(10)　103536-103536　2021/05/29

    DOI： 10.1103/PhysRevD.103.103536 　

  40. Alternative minimal U(1)$_{B−L}$

    Asai, Kento, Nakayama, Kazunori, Tseng, Shih-Yen

    Phys.Lett.B　814　136106-136106　2021/03/10

    DOI： 10.1016/j.physletb.2021.136106 　

  41. Gravitational Production of Hidden Photon Dark Matter in Light of the XENON1T Excess

    Nakayama, Kazunori, Yong Tang

    Phys.Lett.B　811　135977-135977　2020/12/10

    DOI： 10.1016/j.physletb.2020.135977 　

  42. High-frequency Graviton from Inflaton Oscillation

    Yohei Ema, Ryusuke Jinno, Nakayama, Kazunori

    JCAP　09　015-015　2020/09/07

    DOI： 10.1088/1475-7516/2020/09/015 　

  43. Constraint on Vector Coherent Oscillation Dark Matter with Kinetic Function

    Nakayama, Kazunori

    JCAP　08　033-033　2020/08/17

    DOI： 10.1088/1475-7516/2020/08/033 　

  44. Detecting light boson dark matter through conversion into a magnon

    Chigusa, So, Moroi, Takeo, Nakayama, Kazunori

    Phys.Rev.D　101　(9)　096013-096013　2020/05/20

    DOI： 10.1103/PhysRevD.101.096013 　

  45. Signals of Axion Like Dark Matter in Time Dependent Polarization of Light

    Chigusa, So, Moroi, Takeo, Nakayama, Kazunori

    Phys.Lett.B　803　135288-135288　2020/04/10

    DOI： 10.1016/j.physletb.2020.135288 　

  46. Aspects of Nonlinear Effect on Black Hole Superradiance

    Fukuda, Hajime, Nakayama, Kazunori

    JHEP　01　128-128　2020/01/21

    DOI： 10.1007/JHEP01(2020)128 　

  47. A Note on Gravitational Particle Production in Supergravity

    Nakayama, Kazunori

    Phys.Lett.B　797　134857-134857　2019/10/10

    DOI： 10.1016/j.physletb.2019.134857 　

  48. Vector Coherent Oscillation Dark Matter

    Nakayama, Kazunori

    JCAP　10　019-019　2019/10/07

    DOI： 10.1088/1475-7516/2019/10/019 　

  49. Novel Flavon Stabilization with Trimaximal Neutrino Mixing

    Chigusa, So, Kasuya, Shinta, Nakayama, Kazunori

    Phys.Rev.D　100　(1)　015030-015030　2019/07/20

    DOI： 10.1103/PhysRevD.100.015030 　

  50. Production of purely gravitational dark matter: the case of fermion and vector boson

    Ema, Yohei, Nakayama, Kazunori, Tang, Yong

    JHEP　07　060-060　2019/07/11

    DOI： 10.1007/JHEP07(2019)060 　

  51. Moduli Oscillation Induced by Reheating

    Hagihara, Daisuke, Hamaguchi, Koichi, Nakayama, Kazunori

    JCAP　03　024-024　2019/03/13

    DOI： 10.1088/1475-7516/2019/03/024 　

  52. Revisiting the Number-Theory Dark Matter Scenario and the Weak Gravity Conjecture

    Nakayama, Kazunori, Takahashi, Fuminobu, Yanagida, Tsutomu T.

    Phys.Lett.B　790　218-224　2019/03/10

    DOI： 10.1016/j.physletb.2019.01.013 　

  53. Anomalous Discrete Flavor Symmetry and Domain Wall Problem

    Chigusa, So, Nakayama, Kazunori

    Phys.Lett.B　788　249-255　2019/01/10

    DOI： 10.1016/j.physletb.2018.11.027 　

  54. Flavon Stabilization in Models with Discrete Flavor Symmetry

    Chigusa, So, Kasuya, Shinta, Nakayama, Kazunori

    Phys.Lett.B　788　494-499　2019/01/10

    DOI： 10.1016/j.physletb.2018.11.051 　

  55. Stochastic Gravitational Waves from Particle Origin

    Nakayama, Kazunori, Yong Tang

    Phys.Lett.B　788　341-346　2019/01/10

    DOI： 10.1016/j.physletb.2018.11.023 　

  56. Production of Purely Gravitational Dark Matter

    Ema, Yohei, Nakayama, Kazunori, Tang, Yong

    JHEP　09　135-135　2018/09/24

    DOI： 10.1007/JHEP09(2018)135 　

  57. Axion-photon conversion and effects on 21 cm observation

    Moroi, Takeo, Nakayama, Kazunori, Yong Tang

    Phys.Lett.B　783　301-305　2018/08/10

    DOI： 10.1016/j.physletb.2018.07.002 　

  58. Supersymmetric Flaxion

    Ema, Yohei, Daisuke Hagihara, Hamaguchi, Koichi, Moroi, Takeo, Nakayama, Kazunori

    JHEP　04　094-094　2018/04/16

    DOI： 10.1007/JHEP04(2018)094 　

  59. Gravitino problem in inflation driven by inflaton-polonyi Kähler coupling

    Hasegawa, Fuminori, Nakayama, Kazunori, Takahiro Terada, Yamada, Yusuke

    Phys.Lett.B　777　270-274　2018/02/10

    DOI： 10.1016/j.physletb.2017.12.038 　

  60. Explosive Axion Production from Saxion

    Ema, Yohei, Nakayama, Kazunori

    Phys.Lett.B　776　174-181　2018/01/10

    DOI： 10.1016/j.physletb.2017.11.035 　

  61. Electroweak Vacuum Metastability and Low-scale Inflation

    Ema, Yohei, Mukaida, Kyohei, Nakayama, Kazunori

    JCAP　12　030-030　2017/12/14

    DOI： 10.1088/1475-7516/2017/12/030 　

  62. Neutrino CP phases from Sneutrino Chaotic Inflation

    Nakayama, Kazunori, Fuminobu Takahashi, Yanagida, Tsutomu T.

    Phys.Lett.B　773　179-185　2017/10/10

    DOI： 10.1016/j.physletb.2017.08.024 　

  63. Can decaying particle explain cosmic infrared background excess?

    Kohri, Kazunori, Moroi, Takeo, Nakayama, Kazunori

    Phys.Lett.B　772　628-633　2017/09/10

    DOI： 10.1016/j.physletb.2017.07.026 　

  64. Gravitino/Axino as Decaying Dark Matter and Cosmological Tensions

    Hamaguchi, Koichi, Nakayama, Kazunori, Yong Tang

    Phys.Lett.B　772　415-419　2017/09/10

    DOI： 10.1016/j.physletb.2017.06.071 　

  65. Gravitational waves from domain walls and their implications

    Nakayama, Kazunori, Takahashi, Fuminobu, Yokozaki, Norimi

    Phys.Lett.B　770　500-506　2017/07/10

    DOI： 10.1016/j.physletb.2017.05.010 　

  66. Gravitino Problem in Minimal Supergravity Inflation

    Hasegawa, Fuminori, Mukaida, Kyohei, Nakayama, Kazunori, Takahiro Terada, Yamada, Yusuke

    Phys.Lett.B　767　392-397　2017/04/10

    DOI： 10.1016/j.physletb.2017.02.030 　

  67. Violent Preheating in Inflation with Nonminimal Coupling

    Ema, Yohei, Jinno, Ryusuke, Mukaida, Kyohei, Nakayama, Kazunori

    JCAP　02　045-045　2017/02/24

    DOI： 10.1088/1475-7516/2017/02/045 　

  68. Affleck-Dine Leptogenesis with Varying Peccei-Quinn Scale

    Bae, Kyu Jung, Baer, Howard, Hamaguchi, Koichi, Nakayama, Kazunori

    JHEP　02　017-017　2017/02/03

    DOI： 10.1007/JHEP02(2017)017 　

  69. Flaxion: a minimal extension to solve puzzles in the standard model

    Ema, Yohei, Hamaguchi, Koichi, Moroi, Takeo, Nakayama, Kazunori

    JHEP　01　096-096　2017/01/23

    DOI： 10.1007/JHEP01(2017)096 　

  70. Nonthermal Gravitino Production after Large Field Inflation

    Ema, Yohei, Mukaida, Kyohei, Nakayama, Kazunori, Terada, Takahiro

    JHEP　11　184-184　2016/11/30

    DOI： 10.1007/JHEP11(2016)184 　

  71. Fate of Electroweak Vacuum during Preheating

    Ema, Yohei, Mukaida, Kyohei, Nakayama, Kazunori

    JCAP　10　043-043　2016/10/28

    DOI： 10.1088/1475-7516/2016/10/043 　

  72. Electroweak Vacuum Stabilized by Moduli during/after Inflation

    Ema, Yohei, Mukaida, Kyohei, Nakayama, Kazunori

    Phys.Lett.B　761　419-423　2016/10/10

    DOI： 10.1016/j.physletb.2016.08.046 　

  73. Gravitational particle production in oscillating backgrounds and its cosmological implications

    Ema, Yohei, Jinno, Ryusuke, Mukaida, Kyohei, Nakayama, Kazunori

    Phys.Rev.D　94　(6)　063517-063517　2016/09/14

    DOI： 10.1103/PhysRevD.94.063517 　

  74. Viable Chaotic Inflation as a Source of Neutrino Masses and Leptogenesis

    Nakayama, Kazunori, Takahashi, Fuminobu, Yanagida, Tsutomu T.

    Phys.Lett.B　757　32-38　2016/06/10

    DOI： 10.1016/j.physletb.2016.03.051 　

  75. Structure of Kähler potential for D-term inflationary attractor models

    Nakayama, Kazunori, Saikawa, Ken'ichi, Terada, Takahiro, Yamaguchi, Masahide

    JHEP　05　067-067　2016/05/11

    DOI： 10.1007/JHEP05(2016)067 　

  76. CMB Constraint on Dark Matter Annihilation after Planck 2015

    Kawasaki, Masahiro, Nakayama, Kazunori, Sekiguchi, Toyokazu

    Phys.Lett.B　756　212-215　2016/05/10

    DOI： 10.1016/j.physletb.2016.03.005 　

  77. Curvature Perturbation and Domain Wall Formation with Pseudo Scaling Scalar Dynamics

    Ema, Yohei, Nakayama, Kazunori, Takimoto, Masahiro

    JCAP　02　067-067　2016/02/29

    DOI： 10.1088/1475-7516/2016/02/067 　

  78. Gravitational waves from the first order phase transition of the Higgs field at high energy scales

    Jinno, Ryusuke, Nakayama, Kazunori, Takimoto, Masahiro

    Phys.Rev.D　93　(4)　045024-045024　2016/02/22

    DOI： 10.1103/PhysRevD.93.045024 　

  79. On adiabatic invariant in generalized Galileon theories

    Ema, Yohei, Jinno, Ryusuke, Mukaida, Kyohei, Nakayama, Kazunori

    JCAP　10　049-049　2015/10/22

    DOI： 10.1088/1475-7516/2015/10/049 　

  80. Particle Production after Inflation with Non-minimal Derivative Coupling to Gravity

    Ema, Yohei, Jinno, Ryusuke, Mukaida, Kyohei, Nakayama, Kazunori

    JCAP　10　020-020　2015/10/08

    DOI： 10.1088/1475-7516/2015/10/020 　

  81. Higgs inflation and suppression of axion isocurvature perturbation

    Nakayama, Kazunori, Takimoto, Masahiro

    Phys.Lett.B　748　108-112　2015/07/02

    DOI： 10.1016/j.physletb.2015.07.001 　

  82. AMS-02 Antiprotons from Annihilating or Decaying Dark Matter

    Hamaguchi, Koichi, Moroi, Takeo, Nakayama, Kazunori

    Phys.Lett.B　747　523-528　2015/06/18

    DOI： 10.1016/j.physletb.2015.06.041 　

  83. Gravitational Effects on Inflaton Decay

    Ema, Yohei, Jinno, Ryusuke, Mukaida, Kyohei, Nakayama, Kazunori

    JCAP　05　038-038　2015/05/22

    DOI： 10.1088/1475-7516/2015/05/038 　

  84. Prospects of determination of reheating temperature after inflation by DECIGO

    Kuroyanagi, Sachiko, Nakayama, Kazunori, Yokoyama, Jun'ichi

    PTEP　2015　(1)　2015/01/22

    DOI： 10.1093/ptep/ptu176 　

  85. Axion Models with High Scale Inflation

    Moroi, Takeo, Mukaida, Kyohei, Nakayama, Kazunori, Takimoto, Masahiro

    JHEP　11　151-151　2014/11/27

    DOI： 10.1007/JHEP11(2014)151 　

  86. Sneutrino Chaotic Inflation and Landscape

    Murayama, Hitoshi, Nakayama, Kazunori, Takahashi, Fuminobu, Yanagida, Tsutomu T.

    Phys.Lett.B　738　196-200　2014/11/10

    DOI： 10.1016/j.physletb.2014.09.045 　

  87. Polynomial Chaotic Inflation in Supergravity Revisited

    Nakayama, Kazunori, Takahashi, Fuminobu, Yanagida, Tsutomu T.

    Phys.Lett.B　737　151-155　2014/10/07

    DOI： 10.1016/j.physletb.2014.08.043 　

  88. Extra light fermions in $E_6$-inspired models and the 3.5 keV X-ray line signal

    Nakayama, Kazunori, Takahashi, Fuminobu, Yanagida, Tsutomu T.

    Phys.Lett.B　737　311-313　2014/10/07

    DOI： 10.1016/j.physletb.2014.08.061 　

  89. Affleck-Dine baryogenesis with R-parity violation

    Higaki, Tetsutaro, Nakayama, Kazunori, Saikawa, Ken'ichi, Takahashi, Tomo, Yamaguchi, Masahide

    Phys.Rev.D　90　(4)　045001-045001　2014/08/01

    DOI： 10.1103/PhysRevD.90.045001 　

  90. The 3.5 keV X-ray line signal from decaying moduli with low cutoff scale

    Nakayama, Kazunori, Takahashi, Fuminobu, Yanagida, Tsutomu T.

    Phys.Lett.B　735　338-339　2014/07/30

    DOI： 10.1016/j.physletb.2014.06.061 　

  91. Higgs Chaotic Inflation and the Primordial B-mode Polarization Discovered by BICEP2

    Nakayama, Kazunori, Takahashi, Fuminobu

    Phys.Lett.B　734　96-99　2014/06/27

    DOI： 10.1016/j.physletb.2014.05.034 　

  92. Gravitino Problem in Supergravity Chaotic Inflation and SUSY Breaking Scale after BICEP2

    Nakayama, Kazunori, Takahashi, Fuminobu, Yanagida, Tsutomu T.

    Phys.Lett.B　734　358-363　2014/06/27

    DOI： 10.1016/j.physletb.2014.05.078 　

  93. Anomaly-free flavor models for Nambu–Goldstone bosons and the 3.5keV X-ray line signal

    Nakayama, Kazunori, Takahashi, Fuminobu, Yanagida, Tsutomu T.

    Phys.Lett.B　734　178-182　2014/06/27

    DOI： 10.1016/j.physletb.2014.05.035 　

  94. Suppressed Non-Gaussianity in the Curvaton Model

    Mukaida, Kyohei, Nakayama, Kazunori, Takimoto, Masahiro

    Phys.Rev.D　89　(12)　123515-123515　2014/06/19

    DOI： 10.1103/PhysRevD.89.123515 　

  95. Chaotic Inflation with Right-handed Sneutrinos after Planck

    Nakayama, Kazunori, Takahashi, Fuminobu, Yanagida, Tsutomu T.

    Phys.Lett.B　730　24-29　2014/03/07

    DOI： 10.1016/j.physletb.2014.01.022 　

  96. Inflationary Gravitational Waves and the Evolution of the Early Universe

    Jinno, Ryusuke, Moroi, Takeo, Nakayama, Kazunori

    JCAP　01　040-040　2014/01/27

    DOI： 10.1088/1475-7516/2014/01/040 　

  97. The universe dominated by oscillating scalar with non-minimal derivative coupling to gravity

    Jinno, Ryusuke, Mukaida, Kyohei, Nakayama, Kazunori

    JCAP　01　031-031　2014/01/21

    DOI： 10.1088/1475-7516/2014/01/031 　

  98. Curvaton Dynamics Revisited

    Mukaida, Kyohei, Nakayama, Kazunori, Takimoto, Masahiro

    JCAP　06　013-013　2014

    DOI： 10.1088/1475-7516/2014/06/013 　

  99. Dark Matter Chaotic Inflation in Light of BICEP2

    Mukaida, Kyohei, Nakayama, Kazunori

    JCAP　08　062-062　2014

    DOI： 10.1088/1475-7516/2014/08/062 　

  100. Impacts of precision CMB measurements on particle physics

    Nakayama, Kazunori

    PTEP　2014　(6)　2014

    DOI： 10.1093/ptep/ptu079 　

  101. Kinetic Term Anarchy for Polynomial Chaotic Inflation

    Nakayama, Kazunori, Takahashi, Fuminobu, Yanagida, Tsutomu T.

    JHEP　09　014-014　2014

    DOI： 10.1007/JHEP09(2014)014 　

  102. Cosmological constraints on axionic dark radiation from axion-photon conversion in the early Universe

    Higaki, Tetsutaro, Nakayama, Kazunori, Takahashi, Fuminobu

    JCAP　09　030-030　2013/09/25

    DOI： 10.1088/1475-7516/2013/09/030 　

  103. Polynomial Chaotic Inflation in Supergravity

    Nakayama, Kazunori, Takahashi, Fuminobu, Yanagida, Tsutomu T.

    JCAP　08　038-038　2013/08/20

    DOI： 10.1088/1475-7516/2013/08/038 　

  104. Polynomial Chaotic Inflation in the Planck Era

    Nakayama, Kazunori, Takahashi, Fuminobu, Yanagida, Tsutomu T.

    Phys.Lett.B　725　111-114　2013/08/09

    DOI： 10.1016/j.physletb.2013.06.050 　

  105. Cosmological and astrophysical constraints on superconducting cosmic strings

    Miyamoto, Koichi, Nakayama, Kazunori

    JCAP　07　012-012　2013/07/08

    DOI： 10.1088/1475-7516/2013/07/012 　

  106. Heavy gravitino in hybrid inflation

    Kawasaki, Masahiro, Kitajima, Naoya, Nakayama, Kazunori, Yanagida, Tsutomu T.

    JCAP　06　037-037　2013/06/24

    DOI： 10.1088/1475-7516/2013/06/037 　

  107. Anomaly mediation deformed by axion

    Nakayama, Kazunori, Yanagida, Tsutomu T.

    Phys.Lett.B　722　107-110　2013/05/13

    DOI： 10.1016/j.physletb.2013.04.002 　

  108. Axino dark matter with R-parity violation and 130 GeV gamma-ray line

    Endo, Motoi, Hamaguchi, Koichi, Liew, Seng Pei, Mukaida, Kyohei, Nakayama, Kazunori

    Phys.Lett.B　721　111-117　2013/04/10

    DOI： 10.1016/j.physletb.2013.03.008 　

  109. Smooth hybrid inflation in a supersymmetric axion model

    Kawasaki, Masahiro, Kitajima, Naoya, Nakayama, Kazunori

    Phys.Rev.D　87　(3)　035010-035010　2013/02/06

    DOI： 10.1103/PhysRevD.87.035010 　

  110. Revisiting the Cosmological Coherent Oscillation

    Kawasaki, Masahiro, Kitajima, Naoya, Nakayama, Kazunori

    Phys.Rev.D　87　(2)　023513-023513　2013/01/18

    DOI： 10.1103/PhysRevD.87.023513 　

  111. Fate of $Z_2$ Symmetric Scalar Field

    Mukaida, Kyohei, Nakayama, Kazunori, Takimoto, Masahiro

    JHEP　12　053-053　2013

    DOI： 10.1007/JHEP12(2013)053 　

  112. Scalar Trapping and Saxion Cosmology

    Moroi, Takeo, Mukaida, Kyohei, Nakayama, Kazunori, Takimoto, Masahiro

    JHEP　06　040-040　2013

    DOI： 10.1007/JHEP06(2013)040 　

  113. Dynamics of oscillating scalar field in thermal environment

    Mukaida, Kyohei, Nakayama, Kazunori

    JCAP　01　017-017　2013

    DOI： 10.1088/1475-7516/2013/01/017 　

  114. Moduli-Induced Axion Problem

    Higaki, Tetsutaro, Nakayama, Kazunori, Takahashi, Fuminobu

    JHEP　07　005-005　2013

    DOI： 10.1007/JHEP07(2013)005 　

  115. Axions: Theory and Cosmological Role

    Kawasaki, Masahiro, Nakayama, Kazunori

    Ann.Rev.Nucl.Part.Sci.　63　69-95　2013

    DOI： 10.1146/annurev-nucl-102212-170536 　

  116. Dissipative Effects on Reheating after Inflation

    Mukaida, Kyohei, Nakayama, Kazunori

    JCAP　03　002-002　2013

    DOI： 10.1088/1475-7516/2013/03/002 　

  117. Eluding the Gravitino Overproduction in Inflaton Decay

    Nakayama, Kazunori, Takahashi, Fuminobu, Yanagida, Tsutomu T.

    Phys.Lett.B　718　526-531　2012/12/05

    DOI： 10.1016/j.physletb.2012.10.085 　

  118. Gravity mediation without a Polonyi problem

    Nakayama, Kazunori, Takahashi, Fuminobu, Yanagida, Tsutomu T.

    Phys.Lett.B　714　256-261　2012/08/14

    DOI： 10.1016/j.physletb.2012.06.072 　

  119. Imprints of Cosmic Phase Transition in Inflationary Gravitational Waves

    Jinno, Ryusuke, Moroi, Takeo, Nakayama, Kazunori

    Phys.Lett.B　713　129-132　2012/07/09

    DOI： 10.1016/j.physletb.2012.05.061 　

  120. Wino LSP detection in the light of recent Higgs searches at the LHC

    Moroi, Takeo, Nakayama, Kazunori

    Phys.Lett.B　710　159-163　2012/03/29

    DOI： 10.1016/j.physletb.2012.02.058 　

  121. NMSSM in gauge-mediated SUSY breaking without domain wall problem

    Hamaguchi, Koichi, Nakayama, Kazunori, Yokozaki, Norimi

    Phys.Lett.B　708　100-106　2012/02/14

    DOI： 10.1016/j.physletb.2012.01.027 　

  122. Higgs mass and inflation

    Nakayama, Kazunori, Takahashi, Fuminobu

    Phys.Lett.B　707　142-145　2012/01/16

    DOI： 10.1016/j.physletb.2011.12.033 　

  123. Consrtaint on the (GUT) symmetry breaking scale and topological defects Peer-reviewed

    Kohei Kamada, Kazunori Nakayama, Jun'ichi Yokoyama

    GUT2012　1467　182-186　2012

    DOI： 10.1063/1.4742097 　

    ISSN： 0094-243X

    eISSN： 1551-7616

  124. Phase transition and monopole production in supergravity inflation

    Kamada, Kohei, Nakayama, Kazunori, Yokoyama, Jun'ichi

    Phys.Rev.D　85　043503-043503　2012

    DOI： 10.1103/PhysRevD.85.043503 　

  125. Peccei-Quinn extended gauge-mediation model with vector-like matter

    Nakayama, Kazunori, Yokozaki, Norimi

    JHEP　11　158-158　2012

    DOI： 10.1007/JHEP11(2012)158 　

  126. Probing dark radiation with inflationary gravitational waves

    Jinno, Ryusuke, Moroi, Takeo, Nakayama, Kazunori

    Phys.Rev.D　86　123502-123502　2012

    DOI： 10.1103/PhysRevD.86.123502 　

  127. Cosmological Moduli Problem in Low Cutoff Theory

    Nakayama, Kazunori, Takahashi, Fuminobu, Yanagida, Tsutomu T.

    Phys.Rev.D　86　043507-043507　2012

    DOI： 10.1103/PhysRevD.86.043507 　

  128. Higgs mass and muon anomalous magnetic moment in the U(1) extended MSSM

    Endo, Motoi, Hamaguchi, Koichi, Iwamoto, Sho, Nakayama, Kazunori, Yokozaki, Norimi

    Phys.Rev.D　85　095006-095006　2012

    DOI： 10.1103/PhysRevD.85.095006 　

  129. Alchemical Inflation: inflaton turns into Higgs

    Nakayama, Kazunori, Takahashi, Fuminobu

    JCAP　11　007-007　2012

    DOI： 10.1088/1475-7516/2012/11/007 　

  130. Isocurvature perturbations in extra radiation

    Kawasaki, Masahiro, Miyamoto, Koichi, Nakayama, Kazunori, Sekiguchi, Toyokazu

    JCAP　02　022-022　2012

    DOI： 10.1088/1475-7516/2012/02/022 　

  131. A Solution to the mu/Bmu Problem in Gauge Mediation with Hidden Gauge Symmetry

    Hamaguchi, Koichi, Nakayama, Kazunori, Yokozaki, Norimi

    JHEP　08　006-006　2012

    DOI： 10.1007/JHEP08(2012)006 　

  132. Non-Gaussian isocurvature perturbations in dark radiation

    Kawakami, Etsuko, Kawasaki, Masahiro, Miyamoto, Koichi, Nakayama, Kazunori, Sekiguchi, Toyokazu

    JCAP　07　037-037　2012

    DOI： 10.1088/1475-7516/2012/07/037 　

  133. PeV-scale Supersymmetry from New Inflation

    Nakayama, Kazunori, Takahashi, Fuminobu

    JCAP　05　035-035　2012

    DOI： 10.1088/1475-7516/2012/05/035 　

  134. Cosmological Effects of Decaying Cosmic String Loops with TeV Scale Width

    Kawasaki, Masahiro, Miyamoto, Koichi, Nakayama, Kazunori

    2011/05

  135. A theory of extra radiation in the Universe

    Nakayama, Kazunori, Takahashi, Fuminobu, Yanagida, Tsutomu T.

    Phys.Lett.B　697　275-279　2011/03/14

    DOI： 10.1016/j.physletb.2011.02.013 　

  136. Aspects of Hybrid Inflation in Supergravity Peer-reviewed

    Kazunori Nakayama, Fuminobu Takahashi, Tsutomu T. Yanagida

    PROGRESS OF THEORETICAL PHYSICS SUPPLEMENT　(190)　42-49　2011

    DOI： 10.1143/PTPS.190.42 　

    ISSN： 0375-9687

  137. Prospects for determination of thermal history after inflation with future gravitational wave detectors

    Kuroyanagi, Sachiko, Nakayama, Kazunori, Saito, Shun

    Phys.Rev.D　84　123513-123513　2011

    DOI： 10.1103/PhysRevD.84.123513 　

  138. Low-scale Supersymmetry from Inflation

    Nakayama, Kazunori, Takahashi, Fuminobu

    JCAP　10　033-033　2011

    DOI： 10.1088/1475-7516/2011/10/033 　

  139. Domain Walls and Gravitational Waves after Thermal Inflation

    Moroi, Takeo, Nakayama, Kazunori

    Phys.Lett.B　703　160-166　2011

    DOI： 10.1016/j.physletb.2011.07.075 　

  140. On the waterfall behavior in hybrid inflation

    Kodama, Hideo, Kohri, Kazunori, Nakayama, Kazunori

    Prog.Theor.Phys.　126　331-350　2011

    DOI： 10.1143/PTP.126.331 　

  141. Number-Theory Dark Matter

    Nakayama, Kazunori, Takahashi, Fuminobu, Yanagida, Tsutomu T.

    Phys.Lett.B　699　360-363　2011

    DOI： 10.1016/j.physletb.2011.04.035 　

  142. Higgs Chaotic Inflation in Standard Model and NMSSM

    Nakayama, Kazunori, Takahashi, Fuminobu

    JCAP　02　010-010　2011

    DOI： 10.1088/1475-7516/2011/02/010 　

  143. Curvature perturbation from velocity modulation

    Nakayama, Kazunori, Suyama, Teruaki

    Phys.Rev.D　84　063520-063520　2011

    DOI： 10.1103/PhysRevD.84.063520 　

  144. Relaxing the Higgs mass bound in singlet extensions of the MSSM

    Nakayama, Kazunori, Yokozaki, Norimi, Yonekura, Kazuya

    JHEP　11　021-021　2011

    DOI： 10.1007/JHEP11(2011)021 　

  145. Cosmological constraints on dark matter models with velocity-dependent annihilation cross section

    Hisano, Junji, Kawasaki, Masahiro, Kohri, Kazunori, Moroi, Takeo, Nakayama, Kazunori, Sekiguchi, Toyokazu

    Phys.Rev.D　83　123511-123511　2011

    DOI： 10.1103/PhysRevD.83.123511 　

  146. On the Adiabatic Solution to the Polonyi/Moduli Problem

    Nakayama, Kazunori, Takahashi, Fuminobu, Yanagida, Tsutomu T.

    Phys.Rev.D　84　123523-123523　2011

    DOI： 10.1103/PhysRevD.84.123523 　

  147. Cosmological Aspects of Inflation in a Supersymmetric Axion Model

    Kawasaki, Masahiro, Kitajima, Naoya, Nakayama, Kazunori

    Phys.Rev.D　83　123521-123521　2011

    DOI： 10.1103/PhysRevD.83.123521 　

  148. Gravitational waves from kinks on infinite cosmic strings

    Kawasaki, Masahiro, Miyamoto, Koichi, Nakayama, Kazunori

    Phys.Rev.D　81　103523-103523　2010

    DOI： 10.1103/PhysRevD.81.103523 　

  149. Inflation from a Supersymmetric Axion Model

    Kawasaki, Masahiro, Kitajima, Naoya, Nakayama, Kazunori

    Phys.Rev.D　82　123531-123531　2010

    DOI： 10.1103/PhysRevD.82.123531 　

  150. Running Kinetic Inflation

    Nakayama, Kazunori, Takahashi, Fuminobu

    JCAP　11　009-009　2010

    DOI： 10.1088/1475-7516/2010/11/009 　

  151. WIMP dark matter in gauge-mediated SUSY breaking models and its phenomenology

    Hisano, Junji, Nakayama, Kazunori, Sugiyama, Shohei, Takesako, Tomohiro, Yamanaka, Masato

    Phys.Lett.B　691　46-55　2010

    DOI： 10.1016/j.physletb.2010.05.081 　

  152. Implications of CDMS II result on Higgs sector in the MSSM

    Hisano, Junji, Nakayama, Kazunori, Yamanaka, Masato

    Phys.Lett.B　684　246-250　2010

    DOI： 10.1016/j.physletb.2010.01.027 　

  153. Effects of Dark Matter Annihilation on the Cosmic Microwave Background

    Kanzaki, Toru, Kawasaki, Masahiro, Nakayama, Kazunori

    Prog.Theor.Phys.　123　853-865　2010

    DOI： 10.1143/PTP.123.853 　

  154. B-mode polarization induced by gravitational waves from kinks on infinite cosmic strings

    Kawasaki, Masahiro, Miyamoto, Koichi, Nakayama, Kazunori

    Phys.Rev.D　82　103504-103504　2010

    DOI： 10.1103/PhysRevD.82.103504 　

  155. Gravitational Wave Background and Non-Gaussianity as a Probe of the Curvaton Scenario

    Nakayama, Kazunori, Yokoyama, Jun'ichi

    JCAP　01　010-010　2010

    DOI： 10.1088/1475-7516/2010/01/010 　

  156. General Analysis of Inflation in the Jordan frame Supergravity

    Nakayama, Kazunori, Takahashi, Fuminobu

    JCAP　11　039-039　2010

    DOI： 10.1088/1475-7516/2010/11/039 　

  157. Constraint on the gravitino mass in hybrid inflation

    Nakayama, Kazunori, Takahashi, Fuminobu, Yanagida, Tsutomu T.

    JCAP　12　010-010　2010

    DOI： 10.1088/1475-7516/2010/12/010 　

  158. A note on 'The Affleck-Dine Mechanism in Conformally Sequestered Supersymmetry Breaking'

    Nakayama, Kazunori, Takahashi, Fuminobu

    2009/11

  159. Dark matter annihilation effects on the CMB anisotropy

    Masahiro Kawasaki, Kazunori Nakayama

    Proceedings of the 19th Workshop on General Relativity and Gravitation in Japan, JGRG 2009　251-253　2009

  160. Cosmic Rays from Dark Matter Annihilation and Big-Bang Nucleosynthesis

    Hisano, Junji, Kawasaki, Masahiro, Kohri, Kazunori, Moroi, Takeo, Nakayama, Kazunori

    Phys.Rev.D　79　083522-083522　2009

    DOI： 10.1103/PhysRevD.79.083522 　

  161. Phenomenological Aspects of Horava-Lifshitz Cosmology

    Mukohyama, Shinji, Nakayama, Kazunori, Takahashi, Fuminobu, Yokoyama, Shuichiro

    Phys.Lett.B　679　6-9　2009

    DOI： 10.1016/j.physletb.2009.07.005 　

  162. Neutrino Signals from Annihilating/Decaying Dark Matter in the Light of Recent Measurements of Cosmic Ray Electron/Positron Fluxes

    Hisano, Junji, Kawasaki, Masahiro, Kohri, Kazunori, Nakayama, Kazunori

    Phys.Rev.D　79　043516-043516　2009

    DOI： 10.1103/PhysRevD.79.043516 　

  163. Hilltop Non-Gaussianity

    Kawasaki, Masahiro, Nakayama, Kazunori, Takahashi, Fuminobu

    JCAP　01　026-026　2009

    DOI： 10.1088/1475-7516/2009/01/026 　

  164. Non-Gaussianity from Isocurvature Perturbations : Analysis of Trispectrum

    Kawakami, Etsuko, Kawasaki, Masahiro, Nakayama, Kazunori, Takahashi, Fuminobu

    JCAP　09　002-002　2009

    DOI： 10.1088/1475-7516/2009/09/002 　

  165. The R-axion and non-Gaussianity

    Nakayama, Kazunori, Takahashi, Fuminobu

    Phys.Lett.B　679　436-439　2009

    DOI： 10.1016/j.physletb.2009.08.020 　

  166. Constraining Light Gravitino Mass from Cosmic Microwave Background

    Ichikawa, Kazuhide, Kawasaki, Masahiro, Nakayama, Kazunori, Sekiguchi, Toyokazu, Takahashi, Tomo

    JCAP　08　013-013　2009

    DOI： 10.1088/1475-7516/2009/08/013 　

  167. Cosmological Moduli Problem from Thermal Effects

    Nakayama, Kazunori, Takahashi, Fuminobu

    Phys.Lett.B　670　434-436　2009

    DOI： 10.1016/j.physletb.2008.11.046 　

  168. Diffuse gamma-ray background and cosmic-ray positrons from annihilating dark matter

    Kawasaki, Masahiro, Kohri, Kazunori, Nakayama, Kazunori

    Phys.Rev.D　80　023517-023517　2009

    DOI： 10.1103/PhysRevD.80.023517 　

  169. A General Analysis of Non-Gaussianity from Isocurvature Perturbations

    Kawasaki, Masahiro, Nakayama, Kazunori, Sekiguchi, Toyokazu, Suyama, Teruaki, Takahashi, Fuminobu

    JCAP　01　042-042　2009

    DOI： 10.1088/1475-7516/2009/01/042 　

  170. Positron/Gamma-Ray Signatures of Dark Matter Annihilation and Big-Bang Nucleosynthesis

    Hisano, Junji, Kawasaki, Masahiro, Kohri, Kazunori, Nakayama, Kazunori

    Phys.Rev.D　79　063514-063514　2009

    DOI： 10.1103/PhysRevD.79.063514 　

  171. Non-Gaussianity from Baryon Asymmetry

    Kawasaki, Masahiro, Nakayama, Kazunori, Takahashi, Fuminobu

    JCAP　01　002-002　2009

    DOI： 10.1088/1475-7516/2009/01/002 　

  172. Upward muon signals at neutrino detectors as a probe of dark matter properties

    Hisano, Junji, Nakayama, Kazunori, Yang, Masaki J.S.

    Phys.Lett.B　678　101-106　2009

    DOI： 10.1016/j.physletb.2009.06.014 　

  173. Gravitational wave background as a probe of reheating temperature of the Universe Peer-reviewed

    Kazunori Nakayama, S. Saitoh, Y. Suwa, J. Yokoyama

    AIP Conference Proceedings　1078　515-517　2008

    DOI： 10.1063/1.3052013 　

    ISSN： 0094-243X 1551-7616

  174. Probing reheating temperature of the universe with gravitational wave background

    Nakayama, Kazunori, Saito, Shun, Suwa, Yudai, Yokoyama, Jun'ichi

    JCAP　06　020-020　2008

    DOI： 10.1088/1475-7516/2008/06/020 　

  175. Non-Gaussianity from isocurvature perturbations

    Kawasaki, Masahiro, Nakayama, Kazunori, Sekiguchi, Toyokazu, Suyama, Teruaki, Takahashi, Fuminobu

    JCAP　11　019-019　2008

    DOI： 10.1088/1475-7516/2008/11/019 　

  176. Solving Cosmological Problems of Supersymmetric Axion Models in Inflationary Universe

    Kawasaki, Masahiro, Nakayama, Kazunori

    Phys.Rev.D　77　123524-123524　2008

    DOI： 10.1103/PhysRevD.77.123524 　

  177. Space laser interferometers can determine the thermal history of the early Universe

    Nakayama, Kazunori, Saito, Shun, Suwa, Yudai, Yokoyama, Jun'ichi

    Phys.Rev.D　77　124001-124001　2008

    DOI： 10.1103/PhysRevD.77.124001 　

  178. Direct/indirect detection signatures of non-thermally produced dark matter

    Nagai, Minoru, Nakayama, Kazunori

    Phys.Rev.D　78　063540-063540　2008

    DOI： 10.1103/PhysRevD.78.063540 　

  179. Cosmological implications of supersymmetric axion models

    Kawasaki, Masahiro, Nakayama, Kazunori, Senami, Masato

    JCAP　03　009-009　2008

    DOI： 10.1088/1475-7516/2008/03/009 　

  180. Increasing the effective number of neutrinos with decaying particles Peer-reviewed

    Kazuhide Ichikawa, Masahiro Kawasaki, Kazunori Nakayama, Masato Senami, Fuminobu Takahashi

    AIP Conference Proceedings　957　413-416　2007

    DOI： 10.1063/1.2823816 　

    ISSN： 0094-243X 1551-7616

  181. Nonthermal dark matter in mirage mediation

    Nagai, Minoru, Nakayama, Kazunori

    Phys.Rev.D　76　123501-123501　2007

    DOI： 10.1103/PhysRevD.76.123501 　

  182. Affleck-Dine baryogenesis in anomaly-mediated SUSY breaking

    Kawasaki, Masahiro, Nakayama, Kazunori

    JCAP　02　002-002　2007

    DOI： 10.1088/1475-7516/2007/02/002 　

  183. Baryon Asymmetry in Heavy Moduli Scenario

    Kawasaki, Masahiro, Nakayama, Kazunori

    Phys.Rev.D　76　043502-043502　2007

    DOI： 10.1103/PhysRevD.76.043502 　

  184. Increasing effective number of neutrinos by decaying particles

    Ichikawa, Kazuhide, Kawasaki, Masahiro, Nakayama, Kazunori, Senami, Masato, Takahashi, Fuminobu

    JCAP　05　008-008　2007

    DOI： 10.1088/1475-7516/2007/05/008 　

  185. Late-time Affleck-Dine baryogenesis after thermal inflation

    Kawasaki, Masahiro, Nakayama, Kazunori

    Phys.Rev.D　74　123508-123508　2006

    DOI： 10.1103/PhysRevD.74.123508 　

  186. Self-similar evolution of relativistic shock waves emerging from plane-parallel atmospheres

    Nakayama, Kazunori, Shigeyama, Toshikazu

    Astrophys.J.　627　310-318　2005

    DOI： 10.1086/430169 　

Show all ︎Show first 5

Misc. 1

  1. Erratum: Positron and gamma-ray signatures of dark matter annihilation and big-bang nucleosynthesis (Physical Review D - Particles, Fields, Gravitation and Cosmology (2009) 79 (063514)) Peer-reviewed

    Hisano, J., Kawasaki, M., Kohri, K., Nakayama, K.

    Physical Review D - Particles, Fields, Gravitation and Cosmology　80　(2)　2009

    DOI： 10.1103/PhysRevD.80.029907 　

Books and Other Publications 3

  1. 相対論と宇宙の事典

    安東, 正樹, 白水, 徹也, 浅田, 秀樹, 石橋, 明浩, 小林, 努, 真貝, 寿明, 早田, 次郎, 谷口, 敬介

    朝倉書店　2020/06

    ISBN: 9784254131284

  2. 数理科学 2018年12月号

    2018/12

  3. 日本物理学会誌 66, 675 (2011)

    2011

Presentations 106

  1. Reheating with Thermal Dissipation and Primordial Gravitational Waves

    日本物理学会2026 年春季大会　2026/03/24

  2. High frequency gravitational waves from reheating Invited

    Gravitational Waves and the Early Universe: Accelerated Expansion, Dynami- cal Inhomogeneity and Beyond　2026/03/13

  3. High frequency gravitational waves from reheating Invited

    Q-EYES　2025/12/09

  4. High frequency gravitons from reheating Invited

    One day workshop on High Frequency Gravitational Waves　2025/08/07

  5. 物性・量子とダークマター探査 Invited

    micro workshop on Quantum detection of (dark) waves　2025/04/22

  6. Light dark matter search with quantum technology Invited

    QUP workshop　2025/04/08

  7. High frequency gravitons from inflation

    KEK-PH2025 winter　2025/02/20

  8. Nuclear spin metrology for axion dark matter detection Invited

    QUPosium2024　2024/12/09

  9. Light dark matter search with Nitrogen-vacancy centers in diamonds

    日本物理学会 2024 年春季大会　2024/03/21

  10. Light dark matter search with Nitrogen-vacancy centers in diamonds Invited

    FPUA2024　2024/03/14

  11. Light dark matter search with Nitrogen-vacancy centers in diamonds Invited

    UGAP2024　2024/03/05

  12. Theory of Light dark matter search with Nitrogen-vacancy centers in dia- monds Invited

    QUPosium2023　2023/12/12

  13. Theory of light dark matter search Invited

    Neutron Fundamental Physics Workshop　2023/09/22

  14. Viable vector coherent oscillation dark matter

    日本物理学会 2023 年第 78 回年次大会　2023/09/18

  15. 暗黒物質の検出に向けて Invited

    東京大学 物理学教室コロキウム　2023/01/13

  16. Detecting axion/dark-photon dark matter with magnon Invited

    Light Dark World　2022/12/12

  17. Detecting axion/dark-photon dark matter with magnon Invited

    Kashiwa Dark Matter Symposium　2022/12/01

  18. Light dark matter detection with collective excitation in matter Invited

    Physics in LHC and beyond　2022/05/14

  19. New particle search and condensed mater physics Invited

    KEK IPNS-IMSS-QUP joint workshop　2022/02/08

  20. Constraint on vector coherent oscillation dark matter

    日本物理学会 第76回年次大会　2021/03/13

  21. Production of Hidden Photon Dark matter: Recent Developments Invited

    Dark Matter as a Probe to New Physics　2021/02/02

  22. マグノンを用いた軽い暗黒物質検出

    日本物理学会 2020年秋季大会　2020/09/15

  23. 軽い暗黒物質検出のための固体物理入門 Invited

    素粒子物理学の進展2020　2020/09/03

  24. Vector Coherent Oscillation Dark Matter

    日本物理学会 第75回年次大会　2020/03/19

  25. Vector Coherent Oscillation Dark Matter

    第８回観測的宇宙論ワークショップ　2019/12/18

  26. Purely Gravitational Dark Matter

    日本物理学会 2019年秋期大会　2019/09/20

  27. Gravitational Particle Production at Reheating Invited

    The third NRF-JSPS workshop in particle physics, cosmology and gravitation　2019/06/18

  28. Gravitational Particle Production and Dark Matter Invited

    Johns Hopkins Workshop　2019/06/08

  29. Axion-photon conversion and effects on 21cm observation

    日本物理学会 2018年秋期大会　2018/09/14

  30. Production of Purely Gravitational Dark Matter

    COSMO2018　2018/08/28

  31. 宇宙初期の相転移で生成される重力波 Invited

    KEK-Cosmo 2018 Workshop 宇宙重力波検出への期待　2018/01/23

  32. Phase transition and gravitational waves Invited

    Gravitational Wave Physics and Astronomy : Genesis, Area Workshop 2017A　2017/12/07

  33. Flaxion: a minimal extension to solve puzzles in the standard model Invited

    Focus Meeting: new perspectives on light particles　2017/11/28

  34. 物質と反物質の非対称性 Invited

    Flavor Physics Workshop 2017　2017/11/01

  35. Flaxion

    日本物理学会 2017年秋期大会　2017/09/13

  36. Gravitational waves as a probe of physics beyond the standard model Invited

    Physics in LHC and the early Universe　2017/01/10

  37. Moduli-assisted electroweak vacuum

    Hidden Sector Physics and Cosmophysics　2016/12/15

  38. インフレーション理論の現状 Invited

    第６回日大理工・益川塾連携シンポジウム　2016/10/15

  39. Electroweak vacuum stabilized by moduli

    日本物理学会 2016年秋期大会　2016/09/22

  40. Sneutrino chaotic inflation revisited

    日本物理学会 第71回年次大会　2016/03/21

  41. Gravitational Particle Production after Inflation with Extended Gravity Models Invited

    Everything about Gravity　2015/12/15

  42. AMS-02宇宙線反陽子と暗黒物質

    日本物理学会 2015年秋季大会　2015/09/25

  43. AMS-02による宇宙線反陽子観測と暗黒物質 Invited

    「宇宙の歴史をひもとく地下素粒子原子核研究」2015年領域研究会　2015/05/16

  44. Inflationary gravitational waves as a probe of the early universe Invited

    B-mode Cosmology　2015/02/21

  45. Dynamics of oscillating scalar field in the early Universe Invited

    KEK Theory Workshop 2015　2015/01/28

  46. Axion Cosmology with High Scale Inflation

    COSPA2014　2014/12/09

  47. Suppressed Non-Gaussianity in the Curvaton Model

    日本物理学会 2014年秋季大会　2014/09/19

  48. 初期宇宙におけるスカラー場のダイナミクス Invited

    日本物理学会 第69回年次大会　2014/03/27

  49. Anomaly mediation deformed by axion

    Basis of the Universe with Revolutionary Ideas (BURI2014)　2014/02/14

  50. Axionic dark radiation from string moduli

    PASCOS2013　2013/11/20

  51. Inflationary gravitational waves as a probe of the early Universe Invited

    DECIGOワークショップ　2013/10/27

  52. Dynamics of reheating after inflation Invited

    Tohoku Forum for Creativity, Particle Physics and Cosmology after the discovery of Higgs boson　2013/10/24

  53. Scalar Fields in the Universe Invited

    KEKPH2013 FALL　2013/10/01

  54. Axion overproduction from modulus decay

    日本物理学会2013年秋季大会　2013/09/23

  55. Moduli-Induced Axion Problem

    SUSY2013　2013/08/26

  56. Polynomial chaotic inflation in supergravity : toward observable B-modes

    CMB2013　2013/06/10

  57. SUSY Dark Matter Invited

    先端加速器LHCが切り拓くテラスケールの素粒子物理学 ～真空と時空への新たな挑戦～ 研究会　2013/05/25

  58. Probing dark radiation with inflationary gravitational waves

    JGRG22　2012/11/12

  59. 130GeV gamma-ray line and dark matter

    高エネルギーガンマ線でみる極限宇宙2012　2012/09/26

  60. Adiabatic solution to the Polonyi problem and its implications

    日本物理学会2012年秋季大会　2012/09/14

  61. A CP Safe Solution to the mu/Bmu Problem in Gauge Mediation with Hidden Gauge Symmetry

    日本物理学会2012年年次大会　2012/03/25

  62. Reviews on Cosmology : Dark Matter and Radiation Invited

    基研研究会 標準模型を超えた素粒子理論へ向けて　2012/03/21

  63. On the adiabatic solution to the moduli problem

    2012年冬の富山 素粒子宇宙論研究会　2012/02/21

  64. Domain walls and gravitational waves after thermal inflation

    日本物理学会2011年秋季大会　2011/09/18

  65. Phenomenological Aspects of Polonyi/Moduli Problem Invited

    Summer Institute 2011　2011/08/07

  66. Higgs chaotic inflation in standard model and NMSSM

    日本物理学会第66回年次大会　2011/03/25

  67. CMB and physics of the early Universe

    International Workshop on CMB ``Cosmic Microwave Background Radiation and Its Foreground Interstellar Components''　2011/02/17

  68. Issues on supersymmetric hybrid inflation

    Extra-Dimension Probe by Cosmophysics　2010/11/10

  69. Nonthermal dark matter and its observational implications Invited

    Non-thermal Cosmological Histories of the Universe Workshop　2010/10/18

  70. Inflation from a Supersymmetric Axion Model

    JGRG20　2010/09/22

  71. 素粒子模型と暗黒物質の直接および間接検出 Invited

    日本物理学会2010年秋季大会　2010/09/13

  72. Aspects of hybrid inflation in supergravity

    YKIS2010 ``Cosmology -- The Next Generation --''　2010/06/28

  73. 重力波と密度ゆらぎ

    第８回DECIGOワークショップ　2010/06/14

  74. Dark matter annihilation effects on the CMB anisotropy

    日本物理学会第65回年次大会　2010/03/20

  75. Neutrino/gamma-ray signals from annihilating/decaying dark matter

    Focus week on Indirect Dark Matter Search　2009/12/08

  76. Dark matter annihilation effects on the CMB anisotropy

    JGRG19　2009/12/04

  77. Non-Gaussiniaty and Particle Physics Models

    日本物理学会2009年秋季大会　2009/09/12

  78. Cosmological and astrophysical signatures of dark matter annihilation

    COSMO09　2009/09/10

  79. Cosmological/astrophysical signatures of dark matter annihilation

    The KIAS-KAIST-YITP Joint Workshop　2009/09/01

  80. 宇宙線アノマリーと暗黒物質

    Summer Institute 2009　2009/08/05

  81. Non-Gaussianity from isocurvature perturbations

    Focus week on non-Gaussianities in the sky　2009/04/08

  82. Positron Signatures from Dark Matter Annihilation and Big-Bang Nucleosynthesi

    日本物理学会第64回年次大会　2009/03/27

  83. Dark Matter Annihilation and PAMELA/ATIC Anomaly

    高エネルギーガンマ線天体研究会　2009/03/10

  84. Dark Matter Annihilation, Cosmic Rays and Big-Bang Nucleosynthesis

    KEKPH09　2009/03/06

  85. Cosmic Rays from Dark Matter Annihilation and Big-Bang Nucleosynthesis

    Progress in Particle Physics 2008　2009/02/17

  86. Signatures of Dark Matter Annihilation in the Light of PAMELA/ATIC Anomaly

    DARK2009　2009/01/20

  87. Positron Signature from Dark Matter Annihilation and Big-Bang Nucleosynthesis

    宇宙線研究所理論研究会　2008/12/09

  88. Non-Gaussianity from Isocurvature Perturbations

    JGRG18　2008/11/18

  89. Direct/Indirect Detection Signatures of Dark Matter Annihilation

    The 7th RESCEU Symposium on Astroparticle Physics and Cosmology　2008/11/11

  90. 背景重力波観測による初期宇宙熱史と再加熱温度の決定

    日本物理学会2008年秋季大会　2008/09/20

  91. 非熱的暗黒物質とその検出可能性

    「第8回 宇宙における時空,物質,構造の進化」研究会　2008/08/31

  92. Gravitational wave background as a probe of reheating temperature of the Universe

    SUSY08　2008/06/17

  93. Gravitational wave background as a probe of reheating temperature of the Universe

    PASCOS-08　2008/06/05

  94. Probing reheating temperature of the universe with gravitational wave background

    RESCEU-IAP Joint Workshop on the Early Universe　2008/05/15

  95. Are axion models compatible with inflation in supergravity?

    日本物理学会第63回年次大会　2008/03/23

  96. Inflationary cosmology of axion models in supergravity

    Accelerators in the Universe (AIU08)　2008/03/12

  97. Nonthermal dark matter in mirage mediation and its detection possibility

    KEKPH0712　2007/12/14

  98. Cosmological implications of supersymmetric axion models

    宇宙線研究所理論研究会「初期宇宙と素粒子標準模型を超える物理」　2007/12/10

  99. Cosmology of Supersymmetric Axion Models

    JGRG17　2007/12/04

  100. 宇宙の輻射エネルギーと超対称アクシオン模型

    日本物理学会第62回年次大会　2007/09/21

  101. X-ray constraints on decaying particles

    「第７回 宇宙における時空,物質,構造の進化」研究会　2007/09/01

  102. Cosmology of heavy moduli : baryogenesis and non-thermal dark matter

    LHC meeting ``Particle physics in the era of LHC　2007/07/21

  103. Increasing the Effective Number of Neutrinos with Decaying Particles

    PASCOS-07　2007/07/06

  104. Baryon Asymmetry in Heavy Moduli Scenario

    研究会：宇宙初期における時空と物質の進化　2007/05/30

  105. Affleck-Dine baryogenesis in anomaly-mediated SUSY breaking

    日本物理学会2007年春季大会　2007/03/25

  106. Affleck-Dine baryogenesis after thermal inflation

    日本物理学会2006年秋季大会　2006/09/22

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Research Projects 9

  1. 素粒子理論から探る宇宙創生の物理

    中山 和則

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 学術変革領域研究(A)

    Institution: 東北大学

    2026/04/01 - 2031/03/31

  2. 軽い暗黒物質の生成機構および新たな検出方法に関する研究

    中山 和則

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 基盤研究(C)

    Institution: 東北大学

    2024/04/01 - 2029/03/31

  3. 初期宇宙における再加熱過程を通じた高エネルギー物理の探査

    中山 和則

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 基盤研究(C)

    Category: 基盤研究(C)

    2018/04/01 - 2023/03/31

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    （１）近年、ある種の磁性体中において、電磁場とトポロジカルな結合をもつアクシオン的な励起モードが存在することが指摘されている。我々は具体的なトポロジカル磁性体模型において、素粒子アクシオン暗黒物質と固体中のアクシオンの相互作用を求め、これを利用した暗黒物質の新たな検出方法を提案した。 （２）以前の我々の研究において、特定のインフレーション後の再加熱期における爆発的な粒子生成と、それに伴うユニタリティの破れが指摘されていた。この現象を、場の空間曲率という概念を使って一般化し統一的な理解を得ることに成功した。 （3）アクシオン・ダークフォトン暗黒物質のミニマルな模型はU(1)対称性を破るヒッグス場を含む。このヒッグス場の宇宙論的なダイナミクスとそれに伴うアクシオン・ダークフォトン暗黒物質の生成量を詳細に調べ、現在の暗黒物質を説明する新たなパラメータ領域を開拓した。 （4）標準的な熱的残存シナリオにおいて、暗黒物質の一部は宇宙の晴れ上がり頃の時期においても対消滅を続けており、宇宙背景放射の非等方性に影響を与えることが知られている。我々は新たにヘリウムの再結合への暗黒物質対消滅の影響を数値コードに取り入れ、対消滅断面積に対して最新の制限を得た。 (5)宇宙の初期密度揺らぎについて、宇宙論的な大スケールの揺らぎは観測から精密に決められているが、小スケールの揺らぎの大きさについては現状あまり制限されていない。我々は、小スケールの揺らぎが大きくなるとダークマターハロー形成率が上がり、それに伴い暗黒物質対消滅率も上がることに注目し、宇宙背景放射への影響を考慮することで小スケールの揺らぎの大きさに上限を得ることに成功した。

  4. Unraveling the origin of matter and the evolution of the Universe

    Yanagida Tsutomu, IBE masahiro

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

    Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

    Institution: The University of Tokyo

    2014/07/10 - 2019/03/31

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    The puzzles of (a) the small neutrino mass, (b) the baryon asymmetry of the universe, and (c) the dark matter are the keys to reveal the history of the universe. In this theoretical research project, which is one of the projects in the Grant-in-Aid for Scientific Research on Innovative Areas "Revealing the history of the universe with underground particle and nuclear research", we have worked on various topics related to above three puzzles, and published 141 papers and gave 104 talks in conferences and workshops. For example, we have given predictions on the neutrino physics, including the neutrinoless double beta decay that is searched for in the research projects A01 and A02 in this Innovative Area. We have also studied various phenomenological aspects on dark matter and clarified the roles of the direct search experiments conducted by the research projects B01 and B02 in this Innovative Area.

  5. Quest for the Ultimate Theory in terms of rich cosmophysical phenomena caused by fields and particles in the hidden sector

    Kodama Hideo, KOBAYASHI Tatsuo, SODA Jiro, MIZOGUCHI Shun'ya, SUMITOMO Yoske, NOZAWA Masato

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

    Category: Grant-in-Aid for Scientific Research (A)

    2014/06/27 - 2018/03/31

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    We have systematically explored methods to probe whether the unified theory called string theory is the ultimate theory of Nature in terms of observations of phenomena caused by fields and particle in the hidden sector specific to superstring theory. As a result, we have proposed lots of new methods such as the observation of gravitational waves produced by the interaction between black holes and a scalar field called axion, observations of gamma rays from high-energy astrophysical objects and cosmic infrared background radiations, observations of electromagnetic and gravitational waves passing through axion dark matter, new particle searches by accelerator experiments, CMB observations of inflation in the early universe. Further, we have constructed some concrete examples of superstring compactifications that are consistent with both the standard model of elementary particles and cosmology.

  6. Studying inflation models and reheating in the PLANCK era

    Nakayama Kazunori

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)

    Category: Grant-in-Aid for Young Scientists (B)

    Institution: The University of Tokyo

    2014/04/01 - 2018/03/31

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    There are increasing observational evidence of the existence of accelerated expansion era in the very early Universe, called inflation. On the other hand, the physics of ``reheating'' after inflation has been unclear both theoretically and observationally. I studied the physics of reheating in detail, and found rich phenomena which had not been known so far, for example, the decay of Higgs vacuum during reheating, violent particle production phenomena, reheating through gravitational effects. All these results are important as new probes of inflationary Universe.

  7. The exploration of extradimensions in terms of a variety of cosmophysical phenomena caused by axionic moduli

    KODAMA Hideo, OHTA Nobuyoshi, TAKAHASHI Fuminobu, NAKAYAMA Kazunori, OHTA Nobuyoshi, SHIBATA Masaru, MIZOGUCHI Shun'ya, KOBAYASHI Tatsuo, SODA Jiro, KOHRI Kazunori, ISHIBASHI Akihiro, IOKA Kuninito, TAKAHASHI Fuminobu, YOSHINO Hirotaka, NOZZWA Masato, NAGATA Ryo, KAWANAKA Norita, TOMIZAWA Shin'ya

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

    Category: Grant-in-Aid for Scientific Research (A)

    Institution: High Energy Accelerator Research Organization

    2010/04/01 - 2014/03/31

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    In order to open up a new observational/experimental window to the ultimate theory, we have studied axions from both the cosmophysics phenomenology aspect and the superstring/supergravity aspect and have published more than 200 papers. The main achievements are demonstarations of the axion bose nova phenemenon caused by a rotating black hole by numerical simulations and the discovery of its observability by gravitational wave experiments, derivation of a parameter range for axion to resolve the conflict between the high energy gamma-ray observations and the infrared background observation, evaluations of the influences of axions produced by the decay of heavy moduli on cosmic microwave background and derivation of constraints on the compactification of extra-dimensions on the basis of this estimation, derivation of constraints on elementary particle models from cosmological influences of axionic isocurvature perturbations and topological defects.

  8. Quest for the ultimate theory on the basis of direct observations of the early evolution of the universe

    KODAMA Hideo, KAWASAKI Masahiro, YOKOYAMA Jun'ichi, SODA Jiro, TSUJIKAWA Shinji, MUKOHYAMA Shinji, NAKAYAMA Kazunori, KITAZAWA Yoshihisa, CHIBA Takeshi, SHIROMIZU Tetsuya, TANAKA Takahiro, KOHRI Kazunori, TAKAHASHI Fuminobu, NOZZWA Masato, NAKAYAMA Kazunori

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

    Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

    Institution: High Energy Accelerator Research Organization

    2009/07/23 - 2014/03/31

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    In this project, we have pushed forward investigations from the two different directions, the phenomomenology of the universe focused on cosmological fluctuations and the construction of universe models based on unified theories including gravity, and published more than 300 papers. The most significant resutls are the construction of the most general inflation theory with a single driving scalar field and the comparison of its predictions with observations, the construction of a consistent anisotropic inflation model and the derivation of its detailed observational predictions, the construction of a variety of large field inflation models on the basis of 4D supergravity unified theories, derivation of constraints on elementary particle theory on the basis of investigations of axion cosmology by 3D numerical simulations, clarification of the IR divergence problem in quantum correstions to inflation, and systematic studies of various modified gravity theories.

  9. 宇宙におけるバリオン非対称性及び暗黒物質の起源に関する研究

    中山 和則

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 特別研究員奨励費

    Category: 特別研究員奨励費

    Institution: 東京大学

    2007 - 2009

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    近年PAMELA衛星、Fermi衛星によって宇宙線陽電子、電子フラックスの超過成分が観測され、これが暗黒物質対消滅の痕跡である可能性が指摘されている。これを受けて、暗黒物質対消滅とビッグバン元素合成との関係、銀河外拡散ガンマ線への暗黒物質の寄与、銀河中心方向からの高エネルギーニュートリノによる検証可能性などを調べた。将来観測によって暗黒物質対消滅の証拠を検証、あるいは排除出来ることが明らかになった。 また、最近CDMS実験が暗黒物質起源と解釈され得るシグナルイベントを報告した。これに関して、超対称標準模型のパラメータへの示唆、および将来実験での観測可能性を調べた。 一方、宇宙の構造形成の種となる密度揺らぎに関する研究を進めた。特に、密度揺らぎの非ガウス成分と、その素粒子物理への示唆を中心に研究を行なった。暗黒物質の有力候補の一つであるアクシオンにより、等曲率揺らぎの中に非ガウス性が現れる可能性があり、その特徴を詳しく調べた。また、超対称性模型において、超対称性を破る場によって同様の大きな非ガウス性が生成される可能性があることを明らかにした。また、非ガウス性と重力波の観測を組み合わせることで、カーバトンシナリオを検証可能であることを示した。

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Teaching Experience 6

  1. 学問論演習　東北大学

  2. 量子力学II　東北大学

  3. 素粒子論特論　東北大学 大学院

  4. 物理学演習VI　東京大学

  5. 物理学演習I　東京大学

  6. 物理学演習V　東京大学

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