このエントリーをはてなブックマークに追加
ID 23365
本文ファイル
著者
Sakai, S.
NDC
物理学
抄録(英)
We present transport coefficients (shear viscosity, η, and bulk viscosity, ζ) for the gluon system obtained by the lattice QCD. This is an indispensable calculation towards the understanding of "New State of Matter" observed in RHIC. We study the temperature regions of RHIC (1.4 ≤ T / Tc ≤ 1.8) and much higher ones up to T / Tc ~ 20. In RHIC regions, the ratio of shear viscosity to entropy density, η / s, is around ~ 0.1 - 0.4, and satisfies the KSS bound. At high temperature, η becomes two or three oder of magnitude larger.

Our calculation has two limitations: (i) the use of the quench approximation, i.e., without quark pair creation-annihilation effects on vacuum, and (ii) the use of an ansatz for the spectral function. The first point has been well studied in calculations of the spectroscopy and the phase-transition behavior. To investigate the second point, we compare our results with perturbative calculations in high T-regions, and also check the effects of the modification of the spectral function on the viscosity.
掲載誌名
Nuclear Physics A
774巻
1-4号
開始ページ
775
終了ページ
778
出版年月日
2006-08
出版者
Elsevier B.V.
ISSN
0375-9474
NCID
出版者DOI
言語
英語
NII資源タイプ
学術雑誌論文
広大資料タイプ
学術雑誌論文
DCMIタイプ
text
フォーマット
application/pdf
著者版フラグ
author
権利情報
Copyright (c) 2006 Elsevier B.V.
関連情報URL
部局名
情報メディア教育研究センター