The low-temperature behavior of the quark-meson model

Abstract

We revisit the phase diagram of strong-interaction matter for the two-flavor quark-meson model using the Functional Renormalization Group. In contrast to standard mean-field calculations, an unusual phase structure is encountered at low temperatures and large quark chemical potentials. In particular, we identify a regime where the pressure decreases with increasing temperature and discuss possible reasons for this unphysical behavior.

7 pages, 7 figures, v2 corresponds to published version

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• Exact evolution equation for the effective potential
• Inhomogeneous chiral condensates
• Fluctuations in the quark-meson model for QCD with isospin chemical potential
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• Flow equations for spectral functions at finite external momenta
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