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arXiv · 1012.2113

Width of the QCD transition in a Polyakov-loop DSE model

D. Horvatic·D. Blaschke·D. Klabucar·O. Kaczmarek
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Abstract

We consider the pseudocritical temperatures for the chiral and deconfinement transitions within a Polyakov-loop Dyson-Schwinger equation approach which employs a nonlocal rank-2 separable model for the effective gluon propagator. These pseudocritical temperatures differ by a factor of two when the quark and gluon sectors are considered separately, but get synchronized and become coincident when their coupling is switched on. The coupling of the Polyakov-loop to the chiral quark dynamics narrows the temperature region of the QCD transition in which chiral symmetry and deconfinement is established. We investigate the effect of rescaling the parameter T_0 in the Polyakov-loop potential on the QCD transition for both the logarithmic and polynomial forms of the potential. While the critical temperatures vary in a similar way, the width of the transition is stronger affected for the logarithmic potential. For this potential the character of the transition changes from crossover to a first order one when T_0 < 210 MeV, but it remains crossover in the whole range of relevant T_0 values for the polynomial form.

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D. Horvatic, D. Blaschke, D. Klabucar, O. Kaczmarek. 2011-07-13. Width of the QCD transition in a Polyakov-loop DSE model. https://doi.org/10.1103/physrevd.84.016005

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