Equation of state for two flavor QCD at N-t=6

被引：96

作者：

Bernard, C

Blum, T

DeTar, C

Gottlieb, S

Rummukainen, K

Heller, UM

Hetrick, JE

Toussaint, D

Karkkainen, L

Sugar, RL

Wingate, M

机构：

[1] BROOKHAVEN NATL LAB, DEPT PHYS, UPTON, NY 11973 USA

[2] UNIV UTAH, DEPT PHYS, SALT LAKE CITY, UT 84112 USA

[3] INDIANA UNIV, DEPT PHYS, BLOOMINGTON, IN 47405 USA

[4] FLORIDA STATE UNIV, SUPERCOMP COMPUTAT RES INST, TALLAHASSEE, FL 32306 USA

[5] UNIV ARIZONA, DEPT PHYS, TUCSON, AZ 85721 USA

[6] NOKIA RES CTR, FIN-33721 TAMPERE, FINLAND

[7] UNIV CALIF SANTA BARBARA, DEPT PHYS, SANTA BARBARA, CA 93106 USA

[8] UNIV COLORADO, DEPT PHYS, BOULDER, CO 80309 USA

来源：

PHYSICAL REVIEW D | 1997年 / 55卷 / 11期

关键词：

D O I：

10.1103/PhysRevD.55.6861

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We calculate the two flavor equation of state for QCD on lattices with lattice spacing a=(6T)(-1) and find that cutoff effects are substantially reduced compared to an earlier study using a=(4T)(-1). However, it is likely that significant cutoff effects remain. We fit the lattice data to expected forms of the free energy density for a second order phase transition at zero-quark mass, which allows us to extrapolate the equation of state to m(q)=0 and to extract the speed of sound. We find that the equation of state depends weakly on the quark mass for small quark mass.

引用

页码：6861 / 6869

页数：9

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