2019-09-18T18:56:52Zhttps://ir.soken.ac.jp/?action=repository_oaipmhoai:ir.soken.ac.jp:000024742018-10-26T05:14:17Z00002:00428:00016
FLUXES IN STRING/BRANE GAS COSMOLOGYFLUXES IN STRING/BRANE GAS COSMOLOGYenghttp://id.nii.ac.jp/1013/00002389/Thesis or DissertationROSAS-LOPEZ, Igmar Cedrellロサス ロペス , イグマール セドエルIgmar Cedrell, ROSAS-LOPEZ総合研究大学院大学博士（理学）総研大甲第1418号2011-03-24 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-timeby 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.https://ir.soken.ac.jp/?action=repository_action_common_download&item_id=2474&item_no=1&attribute_id=19&file_no=2CC BY-NC-ND2011-12-27