{"created":"2023-06-20T13:22:05.257841+00:00","id":2474,"links":{},"metadata":{"_buckets":{"deposit":"cd6b9795-382b-4ba0-9a4c-6a3a9a2dc69d"},"_deposit":{"created_by":21,"id":"2474","owners":[21],"pid":{"revision_id":0,"type":"depid","value":"2474"},"status":"published"},"_oai":{"id":"oai:ir.soken.ac.jp:00002474","sets":["2:428:16"]},"author_link":["0","0","0"],"item_1_creator_2":{"attribute_name":"著者名","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"ROSAS-LOPEZ, Igmar Cedrell"}],"nameIdentifiers":[{}]}]},"item_1_creator_3":{"attribute_name":"フリガナ","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"ロサス　ロペス　, イグマール　セドエル"}],"nameIdentifiers":[{}]}]},"item_1_date_granted_11":{"attribute_name":"学位授与年月日","attribute_value_mlt":[{"subitem_dategranted":"2011-03-24"}]},"item_1_degree_grantor_5":{"attribute_name":"学位授与機関","attribute_value_mlt":[{"subitem_degreegrantor":[{"subitem_degreegrantor_name":"総合研究大学院大学"}]}]},"item_1_degree_name_6":{"attribute_name":"学位名","attribute_value_mlt":[{"subitem_degreename":"博士（理学）"}]},"item_1_description_12":{"attribute_name":"要旨","attribute_value_mlt":[{"subitem_description":"  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. \r\n  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\r\nby tuning it at the critical value.\r\n  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.","subitem_description_type":"Other"}]},"item_1_description_7":{"attribute_name":"学位記番号","attribute_value_mlt":[{"subitem_description":"総研大甲第1418号","subitem_description_type":"Other"}]},"item_1_select_14":{"attribute_name":"所蔵","attribute_value_mlt":[{"subitem_select_item":"有"}]},"item_1_select_8":{"attribute_name":"研究科","attribute_value_mlt":[{"subitem_select_item":"高エネルギー加速器科学研究科"}]},"item_1_select_9":{"attribute_name":"専攻","attribute_value_mlt":[{"subitem_select_item":"14 素粒子原子核専攻"}]},"item_1_text_10":{"attribute_name":"学位授与年度","attribute_value_mlt":[{"subitem_text_value":"2010"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"ROSAS-LOPEZ, Igmar Cedrell","creatorNameLang":"en"}],"nameIdentifiers":[{}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2016-02-17"}],"displaytype":"simple","filename":"甲1418_要旨.pdf","filesize":[{"value":"196.1 kB"}],"format":"application/pdf","licensetype":"license_11","mimetype":"application/pdf","url":{"label":"要旨・審査要旨","url":"https://ir.soken.ac.jp/record/2474/files/甲1418_要旨.pdf"},"version_id":"bb137481-4f0d-4c65-b763-ec5562b38d07"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"eng"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"thesis","resourceuri":"http://purl.org/coar/resource_type/c_46ec"}]},"item_title":"FLUXES IN STRING/BRANE GAS COSMOLOGY","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"FLUXES IN STRING/BRANE GAS COSMOLOGY"},{"subitem_title":"FLUXES IN STRING/BRANE GAS COSMOLOGY","subitem_title_language":"en"}]},"item_type_id":"1","owner":"21","path":["16"],"pubdate":{"attribute_name":"公開日","attribute_value":"2011-12-27"},"publish_date":"2011-12-27","publish_status":"0","recid":"2474","relation_version_is_last":true,"title":["FLUXES IN STRING/BRANE GAS COSMOLOGY"],"weko_creator_id":"21","weko_shared_id":-1},"updated":"2023-06-20T15:51:04.936029+00:00"}