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The low-temperature behavior of the quark-meson model

Ralf-Arno Tripolt, Bernd-Jochen Schaefer, Lorenz von Smekal, Jochen Wambach
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.
Date of publication: 
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Phys. Rev. D 97, (2018), 034022