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arXiv · 1005.1176

The problem of repulsive quark interactions - Lattice versus mean field models

J. Steinheimer·S. Schramm
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Abstract

We calculate the 2nd and 4th order quark number susceptibilities at zero baryochemical potential, using a PNJL approach and an approach which includes, in a single model, quark and hadronic degrees of freedom. We observe that the susceptibilities are very sensitive to possible quark-quark vector interactions. Compared to lattice data our results suggest that above $T_c$ any mean field type of repulsive vector interaction can be excluded from model calculations. Below $T_c$ our results show only very weak sensitivity on the strength of the quark and hadronic vector interaction. The best description of lattice data around $T_c$ is obtained for a case of coexistence of hadronic and quark degrees of freedom.

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J. Steinheimer, S. Schramm. 2010-05-07. The problem of repulsive quark interactions - Lattice versus mean field models. https://doi.org/10.1016/j.physletb.2010.12.046

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