JMP  Vol.4 No.5 , May 2013
Impact of Vector-Current Interactions on the QCD Phase Diagram
ABSTRACT

Using a nonlocal version of the Polyakov-loop-extended Nambu-Jona-Lasinio model, we investigate effects of a nonderivative vector-current interaction (relating to the quark-number density) at both real and imaginary chemical potentials. This repulsive vector interaction between quarks has the following impact on the chiral first-order phase transition: at imaginary chemical potential it sharpens the transition at the Roberge-Weiss (RW) end point and moves this critical point toward lower temperatures; at real chemical potential, the critical end point moves on a trajectory towards larger chemical potentials and lower temperatures with increasing vector coupling strength. The conditions are discussed at which the first-order phase transition disappears and turns into a smooth crossover.


Cite this paper
T. Hell, K. Kashiwa and W. Weise, "Impact of Vector-Current Interactions on the QCD Phase Diagram," Journal of Modern Physics, Vol. 4 No. 5, 2013, pp. 644-650. doi: 10.4236/jmp.2013.45093.
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