Soni, Vikram and Bhattacharya, Dipankar (2006) A consistent description of neutron stars with quark cores. Solid State Communications, 643 (158-1). p. 643. ISSN 0038-1098

PDF - Published Version Restricted to Registered users only Download (179Kb) | Request a copy

Abstract

We consider the equation of state of hadroninc and quark matter at finite density in mean field theory, through an effective chiral Lagrangian whose parameters (coupling constants) are all fixed by hadronic data. Between three to seven times nuclear density, for charge neutral quark matter in beta equilibrium, we find the ground state to be a neutral pion condensate. With increasing baryon density we then expect nuclear matter, followed by pion condensed quark matter at intermediate density, and finally the diquark colour-flavour CFL condensate. These are all states with chiral spontaneous symmetry breaking (SSB). We find another remarkable feature and this is that the scalar (pseudoscalar) coupling, lambda, has a crucial and unexpected influence on the physics of neutron stars. Neutron stars with pion condensed quark matter cores exist only in a small window, between, 5.7 < lambda < 6.45. Interestingly, this range is consistent with the value of lambda derived from pi, pi scattering data and such stellar cores may carry magnetar strength magnetic fields.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Elsevier.
Subjects:	Physics > Nuclear Physics Physics > Physics of Elementary Particles and Fields Astronomy & Astrophysics
Divisions:	UNSPECIFIED
Depositing User:	Users 27 not found.
Date Deposited:	08 May 2018 08:55
Last Modified:	08 May 2018 08:55
URI:	http://npl.csircentral.net/id/eprint/2437

Actions (login required)

View Item