Isospin- and momentum-dependent effective interactions for the baryon octet and the properties of hybrid stars
Abstract
The isospin- and momentum-dependent MDI interaction, which has been extensively used in intermediate-energy heavy-ion reactions to study the properties of asymmetric nuclear matter, is extended to include the nucleon-hyperon and hyperon-hyperon interactions by assuming the same density, momentum, and isospin dependence as for the nucleon-nucleon interaction. The parameters in these interactions are determined from the empirical hyperon single-particle potentials in symmetric nuclear matter at saturation density. The extended MDI interaction is then used to study in the mean-field approximation the equation of state of hypernuclear matter and also the properties of hybrid stars by including the phase transition from hypernuclear matter to quark matter at high densities. In particular, the effects of attractive and repulsive Sigma N interactions and different values of symmetry energies on the hybrid star properties are investigated.
Description
Journals published by the American Physical Society can be found at http://publish.aps.org/Subject
HYPERON-NUCLEON-INTERACTIONSNEUTRON-STARS
DIRAC PHENOMENOLOGY
PHASE-TRANSITIONS
BRUECKNER THEORY
SIGMA(-) ATOMS
QUARK MATTER
DENSE
MATTER
HYPERNUCLEI
EQUATION
Physics