Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2008-10-27
PoS LATTICE2008:189,2008
Physics
High Energy Physics
High Energy Physics - Lattice
7 pages, 16 figures, presented at the XXVI International Symposium on Lattice Field Theory (LATTICE 2008), July 14-19, 2008, W
Scientific paper
We study the equation of state in two-flavor QCD at finite temperature and density. Simulations are made with the RG-improved gluon action and the clover-improved Wilson quark action. Along the lines of constant physics for $m_{\rm PS}/m_{\rm V} = 0.65$ and 0.80, we compute the derivatives of the quark determinant with respect to the quark chemical potential $\mu_q$ up to the fourth order at $\mu_q=0$. We adopt several improvement techniques in the evaluation. We study thermodynamic quantities and quark number susceptibilities at finite $\mu_q$ using these derivatives. We find enhancement of the quark number susceptibility at finite $\mu_q$, in accordance with previous observations using staggered-type quarks. This suggests the existence of a nearby critical point.
Aoki Sadao
Ejiri Shinji
Hatsuda Tetsuo
Ishii Naohiro
Kanaya Kazuyuki
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