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Topological susceptibility in finite temperature (2+1)-flavor QCD using gradient flow
http://hdl.handle.net/2241/00145990
http://hdl.handle.net/2241/00145990012cda87-c454-4d60-9073-75e074a96c98
名前 / ファイル | ライセンス | アクション |
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PRD_95-5-054502 (278.0 kB)
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Item type | Journal Article(1) | |||||
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公開日 | 2017-04-26 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Topological susceptibility in finite temperature (2+1)-flavor QCD using gradient flow | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源 | http://purl.org/coar/resource_type/c_6501 | |||||
タイプ | journal article | |||||
アクセス権 | ||||||
アクセス権 | open access | |||||
アクセス権URI | http://purl.org/coar/access_right/c_abf2 | |||||
著者 |
谷口, 裕介
× 谷口, 裕介× 金谷, 和至× Suzuki, Hiroshi× Umeda, Takashi |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | We compute the topological charge and its susceptibility in finite temperature (2+1)-flavor QCD on the lattice applying a gradient flow method. With the Iwasaki gauge action and nonperturbatively O(a)-improved Wilson quarks, we perform simulations on a fine lattice with a≃0.07 fm at a heavy u, d quark mass with mπ/mρ≃0.63, but approximately physical s quark mass with mηss/m≃0.74. In a temperature range from T≃174 MeV (Nt=16) to 697 MeV (Nt=4), we study two topics on the topological susceptibility. One is a comparison of gluonic and fermionic definitions of the topological susceptibility. Because the two definitions are related by chiral Ward-Takahashi identities, their equivalence is not trivial for lattice quarks which violate the chiral symmetry explicitly at finite lattice spacings. The gradient flow method enables us to compute them without being bothered by the chiral violation. We find a good agreement between the two definitions with Wilson quarks. The other is a comparison with a prediction of the dilute instanton gas approximation, which is relevant in a study of axions as a candidate of the dark matter in the evolution of the Universe. We find that the topological susceptibility shows a decrease in T which is consistent with the predicted χt(T)∝(T/Tpc)^-8 for three-flavor QCD even at low temperature Tpc<T≲1.5Tpc. | |||||
言語 | en | |||||
書誌情報 |
en : Physical review D 巻 95, 号 5, p. 054502, 発行日 2017-03 |
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ISSN | ||||||
収録物識別子タイプ | PISSN | |||||
収録物識別子 | 2470-0010 | |||||
書誌レコードID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA00773624 | |||||
DOI | ||||||
関連タイプ | isIdenticalTo | |||||
識別子タイプ | DOI | |||||
関連識別子 | https://doi.org/10.1103/PhysRevD.95.054502 | |||||
権利 | ||||||
言語 | en | |||||
権利情報 | (c) 2017 American Physical Society | |||||
出版タイプ | ||||||
出版タイプ | VoR | |||||
出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||
出版者 | ||||||
言語 | en | |||||
出版者 | American Physical Society |