{"created":"2021-03-01T06:44:02.687733+00:00","id":8608,"links":{},"metadata":{"_buckets":{"deposit":"9381a824-7339-4b1b-9d56-f5d81e18ac4e"},"_deposit":{"id":"8608","owners":[],"pid":{"revision_id":0,"type":"depid","value":"8608"},"status":"published"},"_oai":{"id":"oai:tsukuba.repo.nii.ac.jp:00008608","sets":["3:233:253"]},"author_link":["35426"],"item_12_biblio_info_6":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2000","bibliographicIssueDateType":"Issued"}}]},"item_12_date_granted_46":{"attribute_name":"学位授与年月日","attribute_value_mlt":[{"subitem_dategranted":"2000-03-24"}]},"item_12_degree_grantor_44":{"attribute_name":"学位授与大学","attribute_value_mlt":[{"subitem_degreegrantor":[{"subitem_degreegrantor_language":"ja","subitem_degreegrantor_name":"筑波大学"},{"subitem_degreegrantor_language":"en","subitem_degreegrantor_name":"University of Tsukuba"}],"subitem_degreegrantor_identifier":[{"subitem_degreegrantor_identifier_name":"12102","subitem_degreegrantor_identifier_scheme":"kakenhi"}]}]},"item_12_degree_name_43":{"attribute_name":"取得学位","attribute_value_mlt":[{"subitem_degreename":"博士（物理学）"},{"subitem_degreename":"Doctor of Philosophy in Physics"}]},"item_12_description_14":{"attribute_name":"フォーマット","attribute_value_mlt":[{"subitem_description":"application/pdf","subitem_description_type":"Other"}]},"item_12_description_4":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"The naive perturbation theory is known to break down at high temperature (T). This is because higher order terms are enhanced by the powers of T and eventually exceed the lower order terms even if the expansion parameter in the perturbation is small. These large terms at high T are called the hard thermal loops (HTLs).\nTherefore, we need to resum HTLs to obtain sensible results at high T. So far, several methods have been proposed to carry out this resummation. Asone of the promising candidates, self-consistent resummation method has been studied for a long time. However, it was found that the method has difficulties in the\nrenormalization at finite T and in the proof of the Nambu-Goldstone theorem at finite T. In this thesis, we develop an optimized perturbation theory (OPT) at finite temperature in the O(N) Φ4 theory, which can resum higher order terms at finite T without the problems mentioned above. It has the following features: 1. Hard thermal loops are correctly resummed at high T. 2. The renormalization of the ultra-violet divergences can be carried out systematically in any given order of OPT. 3. The Nambu-Goldstone theorem is fulfilled for arbitrary N and the any givenorder of OPT.","subitem_description_language":"en","subitem_description_type":"Abstract"}]},"item_12_description_45":{"attribute_name":"学位授与年度","attribute_value_mlt":[{"subitem_description":"1999","subitem_description_type":"Other"}]},"item_12_description_5":{"attribute_name":"内容記述","attribute_value_mlt":[{"subitem_description":"Bibliography: p. 85-90","subitem_description_language":"en","subitem_description_type":"Other"}]},"item_12_dissertation_number_47":{"attribute_name":"報告番号","attribute_value_mlt":[{"subitem_dissertationnumber":"甲第2306号"}]},"item_access_right":{"attribute_name":"アクセス権","attribute_value_mlt":[{"subitem_access_right":"open access","subitem_access_right_uri":"http://purl.org/coar/access_right/c_abf2"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"知久, 季倫","creatorNameLang":"ja"},{"creatorName":"Chiku, Suenori","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"35426","nameIdentifierScheme":"WEKO"}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_access","date":[{"dateType":"Available","dateValue":"2013-12-18"}],"displaytype":"detail","filename":"A2306.pdf","filesize":[{"value":"91.1 kB"}],"format":"application/pdf","mimetype":"application/pdf","url":{"objectType":"abstract","url":"https://tsukuba.repo.nii.ac.jp/record/8608/files/A2306.pdf"},"version_id":"59520359-fdba-4cf2-b3db-7c493685cd68"},{"accessrole":"open_access","date":[{"dateType":"Available","dateValue":"2013-12-18"}],"displaytype":"detail","filename":"1.pdf","filesize":[{"value":"1.1 MB"}],"format":"application/pdf","mimetype":"application/pdf","url":{"objectType":"fulltext","url":"https://tsukuba.repo.nii.ac.jp/record/8608/files/1.pdf"},"version_id":"4b42b848-b6ed-495d-a2ef-cdd196986e23"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"jpn"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"doctoral thesis","resourceuri":"http://purl.org/coar/resource_type/c_db06"}]},"item_title":"有限温度における最適化された摂動論","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"有限温度における最適化された摂動論","subitem_title_language":"ja"},{"subitem_title":"Optimized perturbation theory at finite temperature","subitem_title_language":"en"}]},"item_type_id":"12","owner":"1","path":["253"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2007-07-25"},"publish_date":"2007-07-25","publish_status":"0","recid":"8608","relation_version_is_last":true,"title":["有限温度における最適化された摂動論"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2023-04-28T06:27:02.065698+00:00"}