Bonn 2020 – wissenschaftliches Programm
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HK 16.3: Vortrag
Dienstag, 31. März 2020, 17:45–18:00, J-HS G
Inhomogeneous phases in the quark-meson model with explicit chiral-symmetry breaking — •Lennart Kurth and Michael Buballa — Theoriezentrum, IKP, TU Darmstadt
The conjectured existence of a critical endpoint of a first-order chiral phase boundary in the QCD phase diagram has triggered tremendous experimental and theoretical activities. Several QCD-inspired models suggest that instead of a first-order transition between homogeneous phases there is an inhomogeneous phase where the chiral condensate periodically varies in space. While in the chiral limit the existence of the inhomogeneous phase appears to be rather robust under model variations, the situation is less clear when chiral symmetry is explicitly broken.
In this talk we discuss the effect of explicit chiral-symmetry breaking on the existence and size of an inhomogeneous phase in the quark-meson model. To this end we perform a stability analysis of the homogeneous phase with respect to developing inhomogeneities. We find that the inhomogeneous region shrinks with increasing pion mass but still survives at the physical value of mπ. The instability of the homogeneous phase occurs in the scalar channel while pseudoscalar fluctuations or the popular chiral density wave are not favored.