2002 Fiscal Year Annual Research Report

宇宙初期における時空と物質の変化

Research Project

Project/Area Number	14102004
Research Institution	The University of Tokyo
Principal Investigator	佐藤勝彦東京大学, 大学院・理学系研究科, 教授 (00111914)
Co-Investigator(Kenkyū-buntansha)	佐々木節大阪大学, 大学院・理学研究科, 教授 (70162386) 吉村太彦東京大学, 宇宙線研究所, 教授 (70108447) 柳田勉東京大学, 大学院・理学系研究科, 教授 (10125677) 須藤靖東京大学, 大学院・理学系研究科, 助教授 (20206569) 川崎雅裕東京大学, 大学院・理学系研究科, 教授 (50202031)
Keywords	宇宙論 / 超新星 / 宇宙線 / 重力理論 / 素粒子的宇宙論 / 構造形成 / ニュートリノ / バリオン数生成
Research Abstract	(1)ニュートリノ宇宙物理と宇宙線(佐藤) 超新星内でのニュートリノ振動の研究からいまだ決定されていないニュートリノ振動のパラメータ、1-3混合角や質量の2乗差に関する情報が超新星ニュートリノが観測されたときえられるとを示した。超高エネルギー宇宙線の伝播のシミュレーションから、観測されている小スケールでのクラスタ事象、大スケールでの一様性などを説明するためには、通常の銀河に起源をもつ宇宙線では説明が困難であり、宇宙初期残存粒子起源などが必要であることをしめした。 (2)多次元宇宙の進化とブレーン世界説(佐々木・白水) ブレーンワールド宇宙論について、そのホログラフィー解釈、量子論的安定性、高次元ブラックホールの唯一性定理の証明、ブレーン上の有効理論の近似的導出法の構築を行った。特に、ブレーン上の有効理論の近似的導出法の構築によって懸案事項であったバルクを解くことが近似的に可能となった。また、余剰次元中に存在するスカラー場がブレーン宇宙上に引き起こす様々な効果を研究した.特にその量子効果に着目してブレーン宇宙の観測的検証可能性を探った。 (3)物質・反物質の非対称性の起源(吉村・川崎・柳田) 電弱バリオン生成機構に関係して、1次元量子系の無限自由度熱環境におけるトンネル現象を調べ、準安定状態で環境からエネルギーをもらって励起が起こり、トンネル確率が増大することを発見した。また、超対称性理論に基づくアフレック・ダイン機構に伴って作られるQボールの宇宙論的進化を有限温度の効果を取り入れて解析した。Gauge-mediated SUSY breaking Modelにおいて、Gravitinoが自然に暗黒物質になる機構がLeptogenesisによる宇宙のバリオン数の説明と矛盾しないことを示した。 (4)観測による初期宇宙理論モデルの検証(須藤・樽家) ダークマターハローの密度プロファイルの非球対称モデルとして、3軸不等楕円モデルを提唱し、それを重力レンズ現象を通じて検証する方法論を提案した。さらに静水圧平衡を仮定して、X線、電波観測と直接比較できるようなガス密度・温度プロファイルを計算した。また、スローンデジタルスカイサーベイの銀河カタログを用いて原始密度ゆらぎのガウス性を検証した。また、数値シミュレーションの解析に基づき、強非線形下の2点相関関数の進化を半解析的に予言する理論モデルを構築した。

Research Products

(34 results)

All Other

All Publications (34 results)

[Publications] S.Ando: "Determining the Supernova Direction by its Neutrinos"Prog. Theor. Phys.. 107. 957 (2002)
[Publications] G.Watanabe: "Mictoscopic Study of Slablike and Rodlike Nuclei : Quantum Molecular Dynamics Approach"Phys. Rev. D. 66. 012801 (2002)
[Publications] K.Takahashi: "Earth effects on supernova neutrinos and their implications for neutrino parameters"Phys. Rev. D. 66. 033006 (2002)
[Publications] S.Nagataki: "Gamma-Ray Burst Neutrino Background and Star Formation History in the Universe"Astropart. Phys.. 18. 551-564 (2003)
[Publications] S.Ando: "Three-generation study of neutrino spin-flavor conversion in supernova and implication for neutrino magnetic moment"Phys. Rev. D. 67. 023004 (2003)
[Publications] S.Ando: "Detectability of the Supernova Relic Neutrinos and Neutrino Oscillation"Astropart. Phys.. 18. 307 (2003)
[Publications] H.Yoshiguchi: "Revision of the Selection Function of the Optical Redshift Survey using the Sloan Digital Sky Survey Early Data Release : Toward an Accurate Estimate of Source Number Density of Ultra-High Energy Cosmic Rays"Pub. Astron. Soc. Japan. 55. 121-132 (2003)
[Publications] M.Fujii: "NATURAL GRAVITINO DARK MATTER AND THERMAL LEPTOGENESIS IN GAUGE MEDIATED SUPERSYMMETRY BREAKING MODELS"Phys. Lett.. B549. 273-283 (2002)
[Publications] M.Fujii: "BARYOGENESIS AND GRAVITINO DARK MATTER IN GAUGE MEDIATED SUPERSYMMETRY BREAKING MODELS"Phys. Rev. D. 66. 123515 (2002)
[Publications] M.Fujii: "SOLUTION TO THE COINCIDENCE PUZZLE OF OMEGA(B)AND OMEGA(DM)"Phys. Lett. B. 542. 80-88 (2002)
[Publications] Wade Naylor: "Casimir energy for de Sitter branes in bulk AdS_5"Phys. Lett. B. 542. 289-294 (2002)
[Publications] Uchida Gen: "Quantum radion on de Sitter branes"Prog. heor. Phys.. 108. 471-494 (2002)
[Publications] Yoshiaki Himemoto: "A bulk scalar in the brane world can mimic the 4-d inflaton dynamics"Phys. Rev. D. 65. 104020 (2002)
[Publications] Luca Amendola: "Correlated perturbations from inflation and the cosmic microwave background"Phys. Rev. Lett.. 88. 211302 (2002)
[Publications] K.Ichikawa: "Constraining the variation of the coupling constants with big bang nucleosynthesis"Physical Review D. 65. 123511-1-123511-7 (2002)
[Publications] M.Fukugita: "Constraints on the Star Formation Rate from Supernova Relic Neutrino Observations"Monthlt Notice of the Royal Astronomical Society. (印刷中). (2003)
[Publications] S.Kasuya: "I-balls"Physics Letters B. (印刷中). (2003)
[Publications] K.Ichikawa: "Remarks on the Cosmic Density of Degenerate Neutrinos"Physical Review D. (印刷中). (2003)
[Publications] Y.P.Jing: "Spatial correlation functions and the pairwise peculiar velocity dispersion of galaxies in the PSC_z survey : implications for the galaxy biasing in cold dark matter models"The Astrophysical Journal. 564. 15-22 (2002)
[Publications] Tatsushi Suginohara: "Quasi-self-Similar Evolution of the Two-Point Correlation Function : Strongly Nonlinear Regime in Ω_0<1 Universes"The Astrophysical Journal. 566. 1-8 (2002)
[Publications] Takashi Hamana: "Reliability of the dark matter clustering in cosmological N-body simulation on scales below the mean separation length of particles"The Astrophysical Journal. 568. 455-462 (2002)
[Publications] Masamune Oguri: "Strong Gravitational Lensing Time Delay Statistics and the Density Profile of Dark Halos"The Astrophysical Journal. 568. 488-499 (2002)
[Publications] Y.P.Jing: "Triaxial Modeling of Halo Density Profiles with High-resolution N-body Simulations"The Astrophysical Journal. 574. 538-553 (2002)
[Publications] Takeshi Kuwabara: "Modeling Pairwise Peculiar Velocity Distribution Function of Dark Matter from Halo Density Profiles"Publications of the Astronomical Society of Japan. 54. 503-513 (2002)
[Publications] Mamoru Shimizu: "Reliability of merger tree realizations of dark halos in the Monte-Carlo modeling of galaxy formation"Publications of the Astronomical Society of Japan. 54. 645-653 (2002)
[Publications] Chiaki Hikage: "Three-Dimensional Genus Statistics of SDSS galaxies in the Early Data Release"Publications of the Astronomical Society of Japan. 54. 707-717 (2002)
[Publications] Masamune Oguri: "Gravitational Lensing Magnification and Time Delay Statistics for Distant Supernovae"The Astrophysical Journal. 583. 584-593 (2003)
[Publications] A.Taruya: "Gravothermal Catastrophe and Tsallis' Generalized Entropy of Self-Gravitating Systems"Physica A. 307. 185-206 (2002)
[Publications] A.Taruya: "Lognormal Property of Weak Lensing Fields"The Astrophysical Journal. 571. 638-653 (2002)
[Publications] H.Ochiai: "Quantum Creation of the Randall-Sundrum bubble"Prog. Theor. Phys. 107. 703-715 (2002)
[Publications] A.M.Ghezelbash: "Slicing and brane dependence of(a)dS/CFT correspondence"Phys. Lett.. B535. 315-320 (2002)
[Publications] G.W.Gibbons: "Uniqueness of nonuniqueness of static black holes in higher dimensions"Phys. Rev. Lett.. 89. 041101 (2002)
[Publications] G.W.Gibbons: "Uniqueness of (dilatonic) charged black holes and black p-branes in higher dimensions"Phys. Rev. D66. 044010 (2002)
[Publications] T.Torii: "Cosmological constant dilaton field and Frued-Rubin compactification"Phys. Lett.. B551. 161-165 (2003)

2002 Fiscal Year Annual Research Report

宇宙初期における時空と物質の変化

Principal Investigator

佐藤 勝彦 東京大学, 大学院・理学系研究科, 教授 (00111914)

Research Products

[Publications] S.Ando: "Determining the Supernova Direction by its Neutrinos"Prog. Theor. Phys.. 107. 957 (2002)

[Publications] G.Watanabe: "Mictoscopic Study of Slablike and Rodlike Nuclei : Quantum Molecular Dynamics Approach"Phys. Rev. D. 66. 012801 (2002)

[Publications] K.Takahashi: "Earth effects on supernova neutrinos and their implications for neutrino parameters"Phys. Rev. D. 66. 033006 (2002)

[Publications] S.Nagataki: "Gamma-Ray Burst Neutrino Background and Star Formation History in the Universe"Astropart. Phys.. 18. 551-564 (2003)

[Publications] S.Ando: "Three-generation study of neutrino spin-flavor conversion in supernova and implication for neutrino magnetic moment"Phys. Rev. D. 67. 023004 (2003)

[Publications] S.Ando: "Detectability of the Supernova Relic Neutrinos and Neutrino Oscillation"Astropart. Phys.. 18. 307 (2003)

[Publications] H.Yoshiguchi: "Revision of the Selection Function of the Optical Redshift Survey using the Sloan Digital Sky Survey Early Data Release : Toward an Accurate Estimate of Source Number Density of Ultra-High Energy Cosmic Rays"Pub. Astron. Soc. Japan. 55. 121-132 (2003)

[Publications] M.Fujii: "NATURAL GRAVITINO DARK MATTER AND THERMAL LEPTOGENESIS IN GAUGE MEDIATED SUPERSYMMETRY BREAKING MODELS"Phys. Lett.. B549. 273-283 (2002)

[Publications] M.Fujii: "BARYOGENESIS AND GRAVITINO DARK MATTER IN GAUGE MEDIATED SUPERSYMMETRY BREAKING MODELS"Phys. Rev. D. 66. 123515 (2002)

[Publications] M.Fujii: "SOLUTION TO THE COINCIDENCE PUZZLE OF OMEGA(B)AND OMEGA(DM)"Phys. Lett. B. 542. 80-88 (2002)

[Publications] Wade Naylor: "Casimir energy for de Sitter branes in bulk AdS_5"Phys. Lett. B. 542. 289-294 (2002)

[Publications] Uchida Gen: "Quantum radion on de Sitter branes"Prog. heor. Phys.. 108. 471-494 (2002)

[Publications] Yoshiaki Himemoto: "A bulk scalar in the brane world can mimic the 4-d inflaton dynamics"Phys. Rev. D. 65. 104020 (2002)

[Publications] Luca Amendola: "Correlated perturbations from inflation and the cosmic microwave background"Phys. Rev. Lett.. 88. 211302 (2002)

[Publications] K.Ichikawa: "Constraining the variation of the coupling constants with big bang nucleosynthesis"Physical Review D. 65. 123511-1-123511-7 (2002)

[Publications] M.Fukugita: "Constraints on the Star Formation Rate from Supernova Relic Neutrino Observations"Monthlt Notice of the Royal Astronomical Society. (印刷中). (2003)

[Publications] S.Kasuya: "I-balls"Physics Letters B. (印刷中). (2003)

[Publications] K.Ichikawa: "Remarks on the Cosmic Density of Degenerate Neutrinos"Physical Review D. (印刷中). (2003)

[Publications] Y.P.Jing: "Spatial correlation functions and the pairwise peculiar velocity dispersion of galaxies in the PSC_z survey : implications for the galaxy biasing in cold dark matter models"The Astrophysical Journal. 564. 15-22 (2002)

[Publications] Tatsushi Suginohara: "Quasi-self-Similar Evolution of the Two-Point Correlation Function : Strongly Nonlinear Regime in Ω_0<1 Universes"The Astrophysical Journal. 566. 1-8 (2002)

[Publications] Takashi Hamana: "Reliability of the dark matter clustering in cosmological N-body simulation on scales below the mean separation length of particles"The Astrophysical Journal. 568. 455-462 (2002)

[Publications] Masamune Oguri: "Strong Gravitational Lensing Time Delay Statistics and the Density Profile of Dark Halos"The Astrophysical Journal. 568. 488-499 (2002)

[Publications] Y.P.Jing: "Triaxial Modeling of Halo Density Profiles with High-resolution N-body Simulations"The Astrophysical Journal. 574. 538-553 (2002)

[Publications] Takeshi Kuwabara: "Modeling Pairwise Peculiar Velocity Distribution Function of Dark Matter from Halo Density Profiles"Publications of the Astronomical Society of Japan. 54. 503-513 (2002)

[Publications] Mamoru Shimizu: "Reliability of merger tree realizations of dark halos in the Monte-Carlo modeling of galaxy formation"Publications of the Astronomical Society of Japan. 54. 645-653 (2002)

[Publications] Chiaki Hikage: "Three-Dimensional Genus Statistics of SDSS galaxies in the Early Data Release"Publications of the Astronomical Society of Japan. 54. 707-717 (2002)

[Publications] Masamune Oguri: "Gravitational Lensing Magnification and Time Delay Statistics for Distant Supernovae"The Astrophysical Journal. 583. 584-593 (2003)

[Publications] A.Taruya: "Gravothermal Catastrophe and Tsallis' Generalized Entropy of Self-Gravitating Systems"Physica A. 307. 185-206 (2002)

[Publications] A.Taruya: "Lognormal Property of Weak Lensing Fields"The Astrophysical Journal. 571. 638-653 (2002)

[Publications] H.Ochiai: "Quantum Creation of the Randall-Sundrum bubble"Prog. Theor. Phys. 107. 703-715 (2002)

[Publications] A.M.Ghezelbash: "Slicing and brane dependence of(a)dS/CFT correspondence"Phys. Lett.. B535. 315-320 (2002)

[Publications] G.W.Gibbons: "Uniqueness of nonuniqueness of static black holes in higher dimensions"Phys. Rev. Lett.. 89. 041101 (2002)

[Publications] G.W.Gibbons: "Uniqueness of (dilatonic) charged black holes and black p-branes in higher dimensions"Phys. Rev. D66. 044010 (2002)

[Publications] T.Torii: "Cosmological constant dilaton field and Frued-Rubin compactification"Phys. Lett.. B551. 161-165 (2003)

佐藤勝彦東京大学, 大学院・理学系研究科, 教授 (00111914)