Quark matter in high-mass neutron stars?

Abstract

The recent measurements of the masses of the pulsars PSR J1614-2230 and PSR J0348-0432 provide independent proof for the existence of neutron stars with masses in range of 2 $M_{\odot }$. This fact has significant implications for the physics of high density matter and it challenges the hypothesis that the cores of NS can be composed of deconfined quark matter. In this contribution we study a description of quark matter based on the Nambu--Jona-Lasinio effective model and construct the equation of state for matter in beta equilibrium. This equation of state together with the hadronic Dirac-Brueckner-Hartree-Fock equation of state is used here to describe neutron star and hybrid star configurations. We show that compact stars masses of 2 $M_{\odot }$ are compatible with the possible existence of deconfined quark matter in their core.

6 pages, 2 figures

References in corpus (6)

• Shapiro delay measurement of a two solar mass neutron star
• A Massive Pulsar in a Compact Relativistic Binary
• Neutron Star Masses and Radii from Quiescent Low-Mass X-ray Binaries
• Modern compact star observations and the quark matter equation of state
• Implications of the measurement of pulsars with two solar masses for quark matter in compact stars and HIC. A NJL model case study
• New Bayesian analysis of hybrid EoS constraints with mass-radius data for compact stars

Cited by in corpus (6)

• Warming Nuclear Pasta with Dark Matter: Kinetic and Annihilation Heating of Neutron Star Crusts
• Hyperon Puzzle, Hadron-Quark Crossover and Massive Neutron Stars
• Contraction of cold neutron star due to in the presence a quark core
• Maximum Mass of Hybrid Stars in the Quark Bag Model
• Constraining Bag constant for Hybrid Neutron stars
• Neutron star calculations with the phenomenological three-nucleon force