Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-09-22
Phys.Rev.D83:094014,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
7 pages, 8 figures
Scientific paper
10.1103/PhysRevD.83.094014
We study the effects of temporal UV-cutoff on the chiral critical surface in hot and dense QCD using a chiral effective model. Recent lattice QCD simulations indicate that the curvature of the critical surface might change toward the direction in which the first order phase transition becomes stronger on increasing the number of lattice sites. To investigate this effect on the critical surface in an effective model approach, we use the Nambu-Jona-Lasinio model with finite Matsubara frequency summation. We find that qualitative feature of the critical surface does not alter appreciably as we decrease the summation number, which is unlike the case what is observed in the recent lattice QCD studies. This may either suggest the dependence of chemical potential on the coupling strength or due to some additional interacting terms such as vector interactions which could play an important role at finite density.
Chen Jiunn-Wei
Kohyama Hiroaki
Raha Udit
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