Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2012-02-28
Physics
High Energy Physics
High Energy Physics - Lattice
7 pages, 7 figures; XXIX International Symposium on Lattice Field Theory - Lattice 2011
Scientific paper
We extend our previous study of the QCD phase structure in the heavy quark region to non-zero chemical potentials. To identify the critical point where the first order deconfining transition terminates, we study an effective potential defined by the probability distribution function of the plaquette and the Polyakov loop. The reweighting technique is shown to be powerful in evaluating the effective potential in a wide range of the plaquette and Polyakov loop expectation values. We adopt the cumulant expansion to overcome the sign problem in the calculation of complex phase of the quark determinant. We find that the method provides us with an intuitive and powerful way to study the phase structure. We estimate the location of the critical point at finite chemical potential in the heavy quark region.
Aoki Sadao
Ejiri Shinji
Hatsuda Tetsuo
Kanaya Kazuyuki
Nakagawa Yasuhiro
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