Momentum dependent meanfield dynamics of compressed nuclear matter and neutron stars
Abstract
Nuclear matter and compact neutron stars are studied in the framework of the nonlinear derivative (NLD) model which accounts for the momentum dependence of relativistic meanfields. The generalized form of the energymomentum tensor is derived which allows to consider different forms of the regulator functions in the NLD Lagrangian. The thermodynamic consistency of the NLD model is demonstrated for arbitrary choice of the regulator functions. The NLD approach describes the bulk properties of the nuclear matter and compares well with microscopic calculations and Dirac phenomenology. We further study the high density domain of the nuclear equation of state (EoS) relevant for the matter in βequilibrium inside neutron stars. It is shown that the low density constraints imposed on the nuclear EoS and by the momentum dependence of the Schrödingerequivalent optical potential lead to a maximum mass of the neutron stars around M≃2M_{⊙} which accommodates the observed mass of the J16142230 millisecond radio pulsar.
 Publication:

Nuclear Physics A
 Pub Date:
 February 2013
 DOI:
 10.1016/j.nuclphysa.2013.01.002
 arXiv:
 arXiv:1206.4821
 Bibcode:
 2013NuPhA.899..133G
 Keywords:

 Nuclear Theory;
 Astrophysics  High Energy Astrophysical Phenomena;
 Nuclear Experiment
 EPrint:
 25 pages, 11 figures, accepted for publication in Nuclear Physics A