Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2012-02-25
Physics
High Energy Physics
High Energy Physics - Lattice
11 pages, 11 figures, 4 tables
Scientific paper
We determine the (pseudo)critical lines of QCD with two degenerate staggered fermions at nonzero temperature and quark or isospin density, in the region of imaginary chemical potentials; analytic continuation is then used to prolongate to the region of real chemical potentials. We obtain an accurate determination of the curvatures at zero chemical potential, quantifying the deviation between the case of finite quark and of finite isospin chemical potential. Deviations from a quadratic dependence of the pseudocritical lines on the chemical potential are clearly seen in both cases: we try different extrapolations and, for the case of nonzero isospin chemical potential, confront them with the results of direct Monte Carlo simulations. Finally we find that, as for the finite quark density case, an imaginary isospin chemical potential can strengthen the transition till turning it into strong first order.
Cea Paolo
Cosmai Leonardo
D'Elia Marcella
Papa Alessandro
Sanfilippo Francesco
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