Quark-hybrid matter in the cores of massive neutron stars

Abstract

Using a nonlocal extension of the SU(3) Nambu-Jona Lasinio model, which reproduces several of the key features of Quantum Chromodynamics, we show that mixed phases of deconfined quarks and confined hadrons (quark-hybrid matter) may exist in the cores of neutron stars as massive as around 2.1 M_Sun. The radii of these objects are found to be in the canonical range of $\sim 12-13$ km. According to our study, the transition to pure quark matter does not occur in stable neutron stars, but is shifted to neutron stars which are unstable against radial oscillations. The implications of our study for the recently discovered, massive neutron star PSR J1614-2230, whose gravitational mass is $1.97\pm 0.04M_{S}un$, are that this neutron star may contain an extended region of quark-hybrid matter at it center, but no pure quark matter.

13 pages, 3 figures

References in corpus (7)

• Shapiro delay measurement of a two solar mass neutron star
• Modern compact star observations and the quark matter equation of state
• Pulsars as Astrophysical Laboratories for Nuclear and Particle Physics
• Quark Number Fluctuations in a Chiral Model at Finite Baryon Chemical Potential
• Nonlocal SU(3) chiral quark models at finite temperature: the role of the Polyakov loop
• Hybrid stars within a covariant, nonlocal chiral quark model
• Vector interaction, charge neutrality and multiple chiral critical point structures

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