Functional renormalization group study of the critical region of the quark-meson model with vector interactions

Understand

The critical region of the two flavour quark-meson model with vector interactions is explored using the Functional Renormalization Group technique, a non-perturbative method that takes into account quantum and thermal fluctuations.

• Special attention is given to the low temperature and high density region of the phase diagram, which is very important for the evolution of proto-neutron stars and to construct the equation of state of compact stars.
• As in previous studies, without repulsive vector interaction, an unphysical region of negative entropy density is found near the first order chiral phase transition.
• We explore the connection between this unphysical region and the chiral critical region, especially the first order line and spinodal lines, using also different values for vector interactions.