2007 Fiscal Year Final Research Report Summary
Research on time-dependent solutions and application to cosmology in superstring theories
| Project/Area Number |
16540250
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Particle/Nuclear/Cosmic ray/Astro physics
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| Research Institution | Kinki University (2006-2007)
Osaka University (2004-2005) |
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Principal Investigator |
OHTA Nobuyoshi Kinki University, Department of Physics, Professor (90167304)
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| Project Period (FY) |
2004 – 2007
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| Keywords | elementary particle physics / Superstring / Inflationary universe / Big bang / black holes |
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| Research Abstract |
We have carried out research related to quantum gravity and its consequences, which is one of the greatest problems in elementary particle physics and gravity. Since the most promising candidate for such a theory, the superstring, is defined in higher dimensions, extra dimensions must be compactified in order to give a realistic description of our world. In this research, we have investigated time-dependent inflationary solutions systematically to obtain realistic models for our universe in the low-energy effective theory of superstring, and clarified the possibility of describing big-bang singularity quantum mechanically by using supersymmetric time-dependent solutions. We have also clarified some properties of higher-dimensional black holes related to superstring. We have also studied physical applications of these results to cosmology. Our results turn out to be very useful in clarifying the interplay between the fundamental theory of particle physics and cosmology. Our concrete res
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ults are as follows.
1. We obtained interesting cosmological solutions systematically in the supergravity as an effective theory of superstring with higher order quantum corrections. These solutions clarify the possibility of explaining inflation at the early universe as well as current accelerating expansion.
2. Supersymmetric solutions are one of the rare system in which we can study their quantum properties. We constructed such siolutions in supergravity and showed that they can be used to describe big-bang singularity in the early universe. We have also studied supersymmetric D2-brane system systematically and clarified their physical properties.
3. It is known that most of the energy of our universe consists of dark matter and dark energy. We pointed out that it is natural that they interact with each other and obtained observational bound on it.
We have also obtained some interesting new results on confinement in QCD by superstring and universality of the entropy-area relation for black holes. Less
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Research Products
(84 results)
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[Presentation] 超弦理論とは何か2008
Author(s)
太田 信義
Organizer
大阪大学理学部オナーセミナー
Place of Presentation
大阪大学理学部
Year and Date
2008-01-22
Description
「研究成果報告書概要(和文)」より
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[Presentation] 超弦理論入門2007
Author(s)
太田 信義
Organizer
集中講義
Place of Presentation
奈良女子大学人間文化研究科
Year and Date
20071217-18-21
Description
「研究成果報告書概要(和文)」より
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[Presentation] 超弦理論入門2006
Author(s)
太田 信義
Organizer
第12回ICEPPシンポジウム
Place of Presentation
長野県白馬
Year and Date
20060226-0301
Description
「研究成果報告書概要(和文)」より
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[Presentation] 超弦理論とブレイン2005
Author(s)
太田 信義
Organizer
集中講義
Place of Presentation
東京工業大学理学研究科
Year and Date
20050613-15
Description
「研究成果報告書概要(和文)」より
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[Presentation] Supertube2005
Author(s)
太田 信義
Organizer
大阪大学COE冬の学校全体講演
Place of Presentation
関西学院大学千刈セミナーハウス
Year and Date
20050314-16
Description
「研究成果報告書概要(和文)」より
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[Presentation] 超弦理論入門2005
Author(s)
太田 信義
Organizer
集中講義
Place of Presentation
埼玉大学理学部,理学研究科
Year and Date
20050116-17
Description
「研究成果報告書概要(和文)」より
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