2003 Fiscal Year Annual Research Report

超弦理論の宇宙論による検証

Research Project

Project/Area Number	13135208
Research Institution	Tokyo Institute of Technology
Principal Investigator	細谷暁夫東京工業大学, 大学院・理工学研究科, 教授 (80028258)
Co-Investigator(Kenkyū-buntansha)	白水徹也東京工業大学, 大学院・理工学研究科, 助教授 (10282716) 野尻伸一防衛大学校, 応用物理学科, 助教授石原秀樹大阪市立大学, 理学部, 教授 (80183739) 椎野克東京工業大学, 大学院・理工学研究科, 助手 (50313325) 伊藤克司東京工業大学, 大学院・理工学研究科, 助教授 (60221769)
Keywords	超弦理論 / 膜理論 / ブラックホール / 宇宙論 / 量子異常
Research Abstract	細谷は共同研究者のブヒャートと森田と共に古典的な宇宙論において、非一様な宇宙とフリードマン宇宙の違いを定量化するために情報理論を応用して、上記の宇宙の質量分布に対して相対エントロピーを導入した。物質優勢の宇宙の場合に、相対エントロピーが増大する条件を求めた。非一様性が小さい場合は必ず増大することも示すことができた。この仕事は2002年の国際重力相対論学会のhonorary mentionを受けた。野尻は観測により確立された現在の宇宙の加速膨張を説明するいくつかのシナリオを調べた。特に、ファントム物質や1/R重力理論を使ったシナリオを中心に調べ、その問題点を明らかにする一方その解決法を示した。石原は高次元宇宙モデルの時空構造を、時空の特異点の観点から研究した。ひとつは,特異点が存在しないコンパクトで一様なEuclid計量をもつEinstein空間の構造を数値的に解析し、分類した。また、裸の特異点が発生する時空では、それがどのように見えるのかを解析した。さらに、ブレイン宇宙モデルでの重力現象を研究し、4次元ブレイン上を伝播する重力波の速度が光速を上回ることを見出した。伊藤はPenrose極限におけるEnhancon時空を背景場をもつ超弦理論とN=2超対称性を持つゲージ理論との双対性について研究した(関野(KEK)との共同研究)。また、荒木-大塚(東工大)と共に、非可換超空間上の超対称ゲージ理論の作用を、物質場がある場合やN=2超対称Yang-Mills理論の場合に構成し、その超対称性の構造、ゲージ不変性について考察した。白水は加速器に於けるブラックホール生成を睨んで、高次元ブラックホールの基礎研究を行った。特に、無限遠方の境界条件を調べるため、空間的無限遠方の漸近構造を調べ、4次元とはまったく異なっていることを一般的に示した。椎野は時空次元自体がどうやって決定されるのか、どうして時空次元は常に整数なのかという問題に取り組んでいる。具体的には、不連続な空間まで量子論的な時空として取り入れることでこの問題を議論することができることを提唱している。

Research Products

(24 results)

All Other

All Publications (24 results)

[Publications] A.Hosoya, T.Buchert, M.Morita: "Information Entropy in Cosmology"Phys.Rev.Lett.. (to appear). (2004)
[Publications] Shin'ichi Nojiri, Sergei D.Odintsov: "MODIFIED GRAVITY WITH NEGATIVE AND POSITIVE POWERS OF THE CURVATURE : UNIFICATION OF THE INFLATION AND OF THE COSMIC ACCELERATION"Physical Review. D68. 123512 (2003)
[Publications] E.Elizalde, J.E.Lidsey, S.Nojiri, S.D.Odintsov: "BORN-INFELD QUANTUM CONDENSATE AS DARK ENERGY IN THE UNIVERSE"Physics Letter. B574. 1-7 (2003)
[Publications] Shin'ichi Nojiri, Sergei D.Odintsov: "WHERE NEW GRAVITATIONAL PHYSICS COMES FROM : M THEORY?"Physics Letter. B576. 5-11 (2003)
[Publications] Shin'ichi Nojiri, Sergei D.Odintsov: "EFFECTIVE EQUATION OF STATE AND ENERGY CONDITIONS IN PHANTOM/TACHYON INFLATIONARY COSMOLOGY PERTURBED BY QUANTUM EFFECTS"Physics Letter. B571. 1-10 (2003)
[Publications] M.Cvetic, S.Nojiri, S.D.Odintsov: "COSMOLOGICAL ANTI-DE SITTER SPACE-TIMES AND TIME DEPENDENT ADS/CFTCORRESPONDENCE"Physicsl Review. D69. 023513 (2004)
[Publications] Shin'ichi Nojiri, Sergei D.Odintsov: "DESITTER BRANE UNIVERSE INDUCED BY PHANTOM AND QUANTUM EFFECTS"Physics Letter. B565. hep-th/0304131-1-hep-th/0304131-9 (2003)
[Publications] Mitsuo Hiragane, Yukinori Yasui, Hideki Ishihara: "COMPACT EINSTEIN SPACES BASED ON QUATERNIONIC KAHLER MANIFOLDS"Classical Quantum Gravity. 20. 3933-3950 (2003)
[Publications] Ken-ichi Nakao, Naoki Kobayashi, Hideki Ishihara: "HOW DOES NAKED SINGULARITY LOOK?"Physical Review. D67. 084002 (2003)
[Publications] Katsushi Ito, Yasuhiro Sekino: "Penrose Limit and Enhancon Geometry"Physical Review. D67. 126005 (2003)
[Publications] Takeo Araki, Katsushi Ito, Akihisa Ohtsuka: "Supersymmetric Gauge Theories on Noncommutative Superspace"Physics Letters. B573. 209 (2003)
[Publications] Takeo Araki, Katsushi Ito, Akihisa Ohtsuka: "N=2 Supersymmetric U(1)Gauge Theories in Noncommutative Harmonic Superspace"Journal of High Energy Physics. 0401. 046 (2003)
[Publications] Tetsuya Shiromizu, Shinya Tomizawa: "SPATIAL INFINITY IN HIGHER DIMENSIONAL SPACETIMES"Phys.Rev.D. (accepted). (2004)
[Publications] T.Uesugi, T.Shiromizu, T.Torii, K.Takahashi: "D-BRANEWORLD COSMOLOGY II : HIGHER ORDER CORRECTIONS"Physical Review. D69. 043511 (2004)
[Publications] T.Shiromizu, D.Ida, S.Tomizawa: "KINEMATICAL BOUND IN ASYMPTOTICALLY TRANSLATIONALLY INVARIANT SPACE-TIMES"Physical Review. D69. 027503 (2004)
[Publications] Tetsuya Shiromizu, Kazuya Koyama, Takashi Torii: "COSMOLOGICAL CONSTANT AND GRAVITATIONAL THEORY ON D-BRANE"Physical Review. D68. 103513 (2003)
[Publications] T.Shiromizu, K.Koyama, S.Onda, Takashi Torii: "CAN WE LIVE ON A D-BRANE? EFFECTIVE THEORY ON A SELFGRAVITATING D-BRANE"Physical Review. D68. 063506 (2003)
[Publications] M.Sami, N.Dadhich, T.Shiromizu: "STEEP INFLATION FOLLOWED BY BORN-INFELD REHEATING"Physics Letter. B568. 118-126 (2003)
[Publications] Tetsuya Shiromizu, Takashi Torii, Tomoko Uesugi: "D BRANE-WORLD COSMOLOGY"Physical Review. D67. 123517
[Publications] Tetsuya Shiromizu, Kazuya Koyama, Keitaro Takahashi: "EFFECTIVE THEORY FOR CLOSE LIMIT OF TWO-BRANES"Physical Review. D67. 104011 (2003)
[Publications] Tetsuya Shiromizu, Kazuya Koyama: "LOW-ENERGY EFFECTIVE THEORY FOR TWO BRANE SYSTEMS : COVARIANT CURVATURE FORMULATION"Physical Review. D67. 084022 (2003)
[Publications] Takashi Torii, Tetsuya Shiromizu: "COSMOLOGICAL CONSTANT, DILATON FIELD AND FREUND-RUBIN COMPACTIFICATION"Physics Letter. B551. 161-165 (2003)
[Publications] S.Hayakawa, D.Ida, T.Shiromizu, T.Tanaka: "GRAVITATION IN THE CODIMENSION TWO BRANE WORLD"Progress Theoretical Physics Supplement. 148. 128-135 (2003)
[Publications] Gary Gibbons, Daisuke Ida, Tetsuya Shiromizu: "UNIQUENESS AND NONUNIQUENESS OF STATIC VACUUM BLACK HOLES IN HIGHERDIMENSIONS"Progress Theoretical Physics Supplement. 148. 284-290 (2003)

2003 Fiscal Year Annual Research Report

超弦理論の宇宙論による検証

Principal Investigator

細谷 暁夫 東京工業大学, 大学院・理工学研究科, 教授 (80028258)

Research Products

[Publications] A.Hosoya, T.Buchert, M.Morita: "Information Entropy in Cosmology"Phys.Rev.Lett.. (to appear). (2004)

[Publications] Shin'ichi Nojiri, Sergei D.Odintsov: "MODIFIED GRAVITY WITH NEGATIVE AND POSITIVE POWERS OF THE CURVATURE : UNIFICATION OF THE INFLATION AND OF THE COSMIC ACCELERATION"Physical Review. D68. 123512 (2003)

[Publications] E.Elizalde, J.E.Lidsey, S.Nojiri, S.D.Odintsov: "BORN-INFELD QUANTUM CONDENSATE AS DARK ENERGY IN THE UNIVERSE"Physics Letter. B574. 1-7 (2003)

[Publications] Shin'ichi Nojiri, Sergei D.Odintsov: "WHERE NEW GRAVITATIONAL PHYSICS COMES FROM : M THEORY?"Physics Letter. B576. 5-11 (2003)

[Publications] Shin'ichi Nojiri, Sergei D.Odintsov: "EFFECTIVE EQUATION OF STATE AND ENERGY CONDITIONS IN PHANTOM/TACHYON INFLATIONARY COSMOLOGY PERTURBED BY QUANTUM EFFECTS"Physics Letter. B571. 1-10 (2003)

[Publications] M.Cvetic, S.Nojiri, S.D.Odintsov: "COSMOLOGICAL ANTI-DE SITTER SPACE-TIMES AND TIME DEPENDENT ADS/CFTCORRESPONDENCE"Physicsl Review. D69. 023513 (2004)

[Publications] Shin'ichi Nojiri, Sergei D.Odintsov: "DESITTER BRANE UNIVERSE INDUCED BY PHANTOM AND QUANTUM EFFECTS"Physics Letter. B565. hep-th/0304131-1-hep-th/0304131-9 (2003)

[Publications] Mitsuo Hiragane, Yukinori Yasui, Hideki Ishihara: "COMPACT EINSTEIN SPACES BASED ON QUATERNIONIC KAHLER MANIFOLDS"Classical Quantum Gravity. 20. 3933-3950 (2003)

[Publications] Ken-ichi Nakao, Naoki Kobayashi, Hideki Ishihara: "HOW DOES NAKED SINGULARITY LOOK?"Physical Review. D67. 084002 (2003)

[Publications] Katsushi Ito, Yasuhiro Sekino: "Penrose Limit and Enhancon Geometry"Physical Review. D67. 126005 (2003)

[Publications] Takeo Araki, Katsushi Ito, Akihisa Ohtsuka: "Supersymmetric Gauge Theories on Noncommutative Superspace"Physics Letters. B573. 209 (2003)

[Publications] Takeo Araki, Katsushi Ito, Akihisa Ohtsuka: "N=2 Supersymmetric U(1)Gauge Theories in Noncommutative Harmonic Superspace"Journal of High Energy Physics. 0401. 046 (2003)

[Publications] Tetsuya Shiromizu, Shinya Tomizawa: "SPATIAL INFINITY IN HIGHER DIMENSIONAL SPACETIMES"Phys.Rev.D. (accepted). (2004)

[Publications] T.Uesugi, T.Shiromizu, T.Torii, K.Takahashi: "D-BRANEWORLD COSMOLOGY II : HIGHER ORDER CORRECTIONS"Physical Review. D69. 043511 (2004)

[Publications] T.Shiromizu, D.Ida, S.Tomizawa: "KINEMATICAL BOUND IN ASYMPTOTICALLY TRANSLATIONALLY INVARIANT SPACE-TIMES"Physical Review. D69. 027503 (2004)

[Publications] Tetsuya Shiromizu, Kazuya Koyama, Takashi Torii: "COSMOLOGICAL CONSTANT AND GRAVITATIONAL THEORY ON D-BRANE"Physical Review. D68. 103513 (2003)

[Publications] T.Shiromizu, K.Koyama, S.Onda, Takashi Torii: "CAN WE LIVE ON A D-BRANE? EFFECTIVE THEORY ON A SELFGRAVITATING D-BRANE"Physical Review. D68. 063506 (2003)

[Publications] M.Sami, N.Dadhich, T.Shiromizu: "STEEP INFLATION FOLLOWED BY BORN-INFELD REHEATING"Physics Letter. B568. 118-126 (2003)

[Publications] Tetsuya Shiromizu, Takashi Torii, Tomoko Uesugi: "D BRANE-WORLD COSMOLOGY"Physical Review. D67. 123517

[Publications] Tetsuya Shiromizu, Kazuya Koyama, Keitaro Takahashi: "EFFECTIVE THEORY FOR CLOSE LIMIT OF TWO-BRANES"Physical Review. D67. 104011 (2003)

[Publications] Tetsuya Shiromizu, Kazuya Koyama: "LOW-ENERGY EFFECTIVE THEORY FOR TWO BRANE SYSTEMS : COVARIANT CURVATURE FORMULATION"Physical Review. D67. 084022 (2003)

[Publications] Takashi Torii, Tetsuya Shiromizu: "COSMOLOGICAL CONSTANT, DILATON FIELD AND FREUND-RUBIN COMPACTIFICATION"Physics Letter. B551. 161-165 (2003)

[Publications] S.Hayakawa, D.Ida, T.Shiromizu, T.Tanaka: "GRAVITATION IN THE CODIMENSION TWO BRANE WORLD"Progress Theoretical Physics Supplement. 148. 128-135 (2003)

[Publications] Gary Gibbons, Daisuke Ida, Tetsuya Shiromizu: "UNIQUENESS AND NONUNIQUENESS OF STATIC VACUUM BLACK HOLES IN HIGHERDIMENSIONS"Progress Theoretical Physics Supplement. 148. 284-290 (2003)

細谷暁夫東京工業大学, 大学院・理工学研究科, 教授 (80028258)