Speaker
Prof.
David Blaschke
(JINR Dubna)
Description
We investigate the effectve repulsive interaction of Pauli blocking due to quark
exchange among nucleons in nuclear matter within a nonrelativistic potential model for the
nucleons. In order to describe nuclear saturation properties the nucleons are coupled to scalar and
vector meanfields in the spirit of a linear Walecka model. The effects of chiral symmetry restoration
is studies by adopting density-dependent quark masses that follow either the Brown-Rho scaling or
the behaviour of a NJL model with 8-quark interaction terms (hNJL). When compared to the results
for density-independent quark masses a strong density-dependent stiffening of the nuclear matter
is obtained. The resulting symmetric nuclear matter equation of state is compared with results for
the excluded-volume corrected density-dependent relativistic mean-field model DD2. Applications
to neutron matter as well as to neutron star matter in beta-equilibrium are studied. The phase
transition to quark matter described by the hNJL model is constructed and hybrid star sequences
are obtained that form a third family of compact stars at high mass.
