title: Phase Transitions in Neutron Stars and Maximum Masses.
abstract: Using the most recent realistic effective interactions for nuclear matter with a smooth extrapolation to high densities including causality, we constrain the equation of state and calculate maximum masses of rotating neutron stars. First- and second-order phase transitions to, e.g., quark matter at high densities are included. If neutron star masses of approximately 2.3 M middle dot in circle from quasi-periodic oscillations in low-mass X-ray binaries are confirmed, a soft equation of state as well as strong phase transitions can be excluded in neutron star cores.
authors.initials: H
authors.lastname: Heiselberg
authors.initials: M
authors.lastname: Hjorth-Jensen