Dense Matter and Neutron Stars in Parity Doublet Models
  We investigate the properties of dense matter and neutron stars. In particular we discuss model calculations based on the parity doublet picture of hadronic chiral symmetry. In this ansatz the onset of chiral symmetry restoration is reflected by the degeneracy of baryons and their parity partners. In this approach we also incorporate quarks as degrees of freedom to be able to study hybrid stars. 
S. Schramm, V. Dexheimer, R. Negreiros, J. Steinheimer
nucl-th astro-ph.HE