Lattice2010

Session

Parallel 27: Nonzero temperature and density

15 Jun 2010, 14:30

Villasimius, Sardinia

210. Constraints on the QCD phase diagram at imaginary mu

Owe Philipsen (University of Frankfurt)

15/06/2010, 14:30

Nonzero temperature and density

We present unambiguous evidence from lattice simulations of QCD with three degenerate quark species for two tricritical points in the $(T,m)$ phase diagramat fixed imaginary $\mu/T=i\pi/3$ mod $2\pi/3$, one in the light and one in the heavy mass regime. They represent the boundaries of the chiral and deconfinement critical lines continued to imaginary chemical potential, respectively. It...

132. Curvature of the QCD phase transition line in a finite volume

Bertram Klein (Physik Department, Technische Universität München)

15/06/2010, 14:50

Nonzero temperature and density

The curvature which characterizes the QCD phase transition at finite temperature and small values of the chemical potential is accessible to lattice simulations. The results for this quantity which have been obtained by several different lattice simulation methods differ due to different numbers of flavors, different pion masses and different sizes of the simulations volumes. In order to...

139. The critical line of QCD with four degenerate quarks

Leonardo Cosmai (INFN Bari)

15/06/2010, 15:10

Nonzero temperature and density

We determine the pseudo-critical couplings at imaginary chemical potentials by high-statistics Monte Carlo simulations of QCD with four degenerate quarks at non-zero temperature and baryon density by the method of analytic continuationan. We reveal deviations from the simple quadratic dependence on the chemical potential visible in earlier works on the same subject. Finally, we discuss the...

213. Hadron properties at finite temperature and density with two-flavors of Wilson fermion

Hideaki Iida (Hashimoto Mathematical Physics Laboratory, Nishina Center, RIKEN, Japan)

15/06/2010, 15:30

Nonzero temperature and density

Spatial meson correlators at finite temperature are studied on lattice QCD. Two-flavor gauge configurations of 16^3*4 lattice with the RG improved gluon action and the clover-improved Wilson quark action, generated by WHOT-QCD collaboration, are employed [1]. The simulations are performed along the lines of constant physics, on which the mass ratio of pseudo-scalar meson to vector...

6. QCD at finite chemical potential in a small hyperspherical box

Joyce Myers (Swansea University)

15/06/2010, 15:50

Nonzero temperature and density

We consider the phase diagram of QCD formulated in small spatial volumes. The benefit of the small spatial volume is that it allows for a perturbative calculation of the phase diagram which is valid for all temperatures and densities. The action of QCD is complex when the quarks are coupled to a non-zero chemical potential. This results in the sign problem which prevents lattice simulations...