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FLUXES IN STRING/BRANE GAS COSMOLOGY
https://ir.soken.ac.jp/records/2474
https://ir.soken.ac.jp/records/2474d8456d96-cfe7-441c-9e4d-a15911535137
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
要旨・審査要旨 (196.1 kB)
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| Item type | 学位論文 / Thesis or Dissertation(1) | |||||||
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| 公開日 | 2011-12-27 | |||||||
| タイトル | ||||||||
| タイトル | FLUXES IN STRING/BRANE GAS COSMOLOGY | |||||||
| タイトル | ||||||||
| タイトル | FLUXES IN STRING/BRANE GAS COSMOLOGY | |||||||
| 言語 | en | |||||||
| 言語 | ||||||||
| 言語 | eng | |||||||
| 資源タイプ | ||||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_46ec | |||||||
| 資源タイプ | thesis | |||||||
| 著者名 |
ROSAS-LOPEZ, Igmar Cedrell
× ROSAS-LOPEZ, Igmar Cedrell
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| フリガナ |
ロサス ロペス , イグマール セドエル
× ロサス ロペス , イグマール セドエル
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| 著者 |
ROSAS-LOPEZ, Igmar Cedrell
× ROSAS-LOPEZ, Igmar Cedrell
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| 学位授与機関 | ||||||||
| 学位授与機関名 | 総合研究大学院大学 | |||||||
| 学位名 | ||||||||
| 学位名 | 博士（理学） | |||||||
| 学位記番号 | ||||||||
| 内容記述タイプ | Other | |||||||
| 内容記述 | 総研大甲第1418号 | |||||||
| 研究科 | ||||||||
| 値 | 高エネルギー加速器科学研究科 | |||||||
| 専攻 | ||||||||
| 値 | 14 素粒子原子核専攻 | |||||||
| 学位授与年月日 | ||||||||
| 学位授与年月日 | 2011-03-24 | |||||||
| 学位授与年度 | ||||||||
| 値 | 2010 | |||||||
| 要旨 | ||||||||
| 内容記述タイプ | Other | |||||||
| 内容記述 | In this work we study how the introduction of a two-form field flux modifies the dynamics of string gas cosmology in different schemes. In chapter 1, we give a short introduction to the string gas cosmology model. In chapter 2 we present the T-duality invariant string gas cosmology modelof Greene, Kabat and Marnerides which replaces the Newtonian-like kinetic terms in the dilaton gravity action by their relativistic counterparts. We introduce the contribution of the two-form field into this model. The two-form flux induces a repulsive potential term in the effective action for the scale factor of the spatial dimensions. Without the two-form field flux, the universe fails to expand when the pressure due to string modes vanishes. With the presence of a homogeneous two-form field flux, it propels 3 spatial dimensions to grow into a macroscopic 4 dimensional space-time. We find that it triggers an expansion of a universe away from the oscillating phase around the self-dual radius. Using the same model we also investigate the effects of a constant two-form field. We can obtain an expanding 4 dimensional space-time by tuning it at the critical value. In chapter 3 we investigate the behaviour of the two-form field in two different models equipped with a moduli stabilization mechanism. The first model uses D-branes, NS5 branes and KK5 monopoles in order to fix the moduli. A simplified KK5-D1 with a two-form field is analyzed. We include the two-form field into the system and conclude that the dilaton is no longer stabilized in this extended model. The second scheme we study consist of a cosmology in which the moduli are fixed using superpotentials. We assume a situation where all the moduli have been fixed except the radion. We find that the inclusion of a two-form field in the action gives a contribution to the effective potential of the radion that helps enhance the stabilization mechanism. |
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| 所蔵 | ||||||||
| 値 | 有 | |||||||
