WEKO3
アイテム
Lattice calculation of the QGP viscosities : Present results and Next Project
https://hiroshima.repo.nii.ac.jp/records/2001001
https://hiroshima.repo.nii.ac.jp/records/2001001c7f9b5b4-a601-46ef-9042-e3a820d45956
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
PoS_LATTICE2007_221.pdf (220.8 KB)
|
| Item type | デフォルトアイテムタイプ_（フル）(1) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 公開日 | 2023-03-18 | |||||||||
| タイトル | ||||||||||
| タイトル | Lattice calculation of the QGP viscosities : Present results and Next Project | |||||||||
| 言語 | en | |||||||||
| 作成者 |
Sakai, Sunao
× Sakai, Sunao
× Nakamura, Atsushi
|
|||||||||
| 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 | |||||||||
| 権利情報 | ||||||||||
| 権利情報 | (c) Copyright owned by the author(s) under the terms of the Creative Commons Attribution - Non Commercial - Share Alike Licence | |||||||||
| 主題 | ||||||||||
| 主題Scheme | NDC | |||||||||
| 主題 | 420 | |||||||||
| 内容記述 | ||||||||||
| 内容記述 | The shear and bulk viscosities of gluon plasma are calculated by accumulating a large amount of data for the Matsubara Green function ($G_{¥beta}(t_m)$) on isotropic $24^3 ¥times 8$ and $16^3 ¥times 8$ lattices. In the case of Iwasaki's improved action, the calculations of $G_{¥beta}(t_m)$ are carried out on roughly 6 million configurations, while for the standard action the calculations are done on more than 16 million configurations. The shear viscosities increase roughly with $T^3$, and $¥eta/s$ ratios are close to the KSS lower bound in the region where $1<T/T_c<25$. Using these data the bulk viscosities are also determined in the region where $T/T_c < 2$. They are roughly one order of magnitude smaller than the shear viscosities. Our next target is to determine the transport coefficients more precisely by a maximum-entropy method. For this purpose the most effective method may be to adopt an anisotropic lattice. In this report, we study the possible systematic error due to the deformation of the anisotropic lattice at short distances. Near the critical temperature, it is found that the standard action suffers from a large deformation on the anisotropic lattice at short distances, while the deformation is slight for Iwasaki's improved action. To reduce the fluctuation of the Matsubara Green function, the improvement of the energy momentum tensor operator by using clover-type loops is promising. We are also attempting to apply the multi-level algorithm to reduce fluctuation. | |||||||||
| 言語 | en | |||||||||
| 内容記述 | ||||||||||
| 内容記述タイプ | Other | |||||||||
| 内容記述 | The XXV International Symposium on Lattice Field Theory ; Place : Regensburg, Germany ; Date : July 30-4 August, 2007 | |||||||||
| 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_5794 | |||||||||
| 資源タイプ | conference paper | |||||||||
| 出版タイプ | ||||||||||
| 出版タイプ | VoR | |||||||||
| 出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||||||
| 関連情報 | ||||||||||
| 識別子タイプ | URI | |||||||||
| 関連識別子 | http://pos.sissa.it/ | |||||||||
| 開始ページ | ||||||||||
| 開始ページ | 221 | |||||||||
| 書誌情報 |
Proceeding of Science Proceeding of Science 巻 Lattice, 号 2007, p. 221, 発行日 2007 |
|||||||||
| 旧ID | 23368 | |||||||||
