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  1. 020 学位論文
  2. 高エネルギー加速器科学研究科
  3. 14 素粒子原子核専攻

FLUXES IN STRING/BRANE GAS COSMOLOGY

https://ir.soken.ac.jp/records/2474
https://ir.soken.ac.jp/records/2474
d8456d96-cfe7-441c-9e4d-a15911535137
名前 / ファイル ライセンス アクション
甲1418_要旨.pdf 要旨・審査要旨 (196.1 kB)
Item type 学位論文 / Thesis or Dissertation(1)
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

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

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

en 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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