The effect of momentum anisotropy on quark matter in the quark-meson model

We investigate the chiral phase structure of quark matter with spheroidal momentum-space anisotropy specified by one anisotropy parameter $\xi$ in the 2+1 flavor quark-meson model. We find the chiral phase diagram and the location of the critical endpoint (CEP) are affected significantly by the value of $\xi$. With the increase of $\xi$, the CEP is shifted to smaller temperatures and larger quark chemical potentials. And the temperature of the CEP is more sensitive to the anisotropy parameter than the one associated quark chemical potential coordinate, which is opposite to the study for finite system volume effect. Furthermore, the effect of momentum anisotropy on the thermodynamics properties and scalar (pseudoscalar) meson masses also is studied at vanishing quark chemical potential. The numerical results show that an increase of $\xi$ can hinder the restoration of chiral symmetry. We also find that shear viscosity and electrical conductivity decreases as $\xi$ grows. However, bulk viscosity exhibits a significant non-trivial behavior with $\xi$ in the entire temperature domain of interest.