Lattice QCD constraints on hybrid and quark stars

A QCD-motivated dynamical-quasiparticle model with parameters adjusted to reproduce the lattice-QCD equation of state is extrapolated from the region of high temperatures and moderate baryonic densities to the domain of high baryonic densities and zero temperature. The resulting equation of state ma...

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Bibliographic Details
Published in:Physical review. C, Nuclear physics Nuclear physics, 2005-08, Vol.72 (2), Article 025804
Main Authors: Ivanov, Yu. B., Khvorostukhin, A. S., Kolomeitsev, E. E., Skokov, V. V., Toneev, V. D., Voskresensky, D. N.
Format: Article
Language:English
Subjects:
BAG MODEL
BARYONS
COMPARATIVE EVALUATIONS
EQUATIONS OF STATE
EXTRAPOLATION
LATTICE FIELD THEORY
NEUTRON STARS
NUCLEAR PHYSICS AND RADIATION PHYSICS
PHASE TRANSFORMATIONS
QUANTUM CHROMODYNAMICS
QUARK MATTER
QUARKS
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Summary:A QCD-motivated dynamical-quasiparticle model with parameters adjusted to reproduce the lattice-QCD equation of state is extrapolated from the region of high temperatures and moderate baryonic densities to the domain of high baryonic densities and zero temperature. The resulting equation of state matched with realistic hadronic equations of state predicts a phase transition into the quark phase at higher densities than those reachable in neutron star interiors. This excludes the possibility of the existence of hybrid (hadron-quark) stars. Pure quark stars are possible and have low masses, small radii, and very high central densities. Similar results are obtained for a simple bag model with massive quarks, fitted to reproduce the same lattice results. Self-bound quark matter is also excluded within these models. Uncertainties in the present extrapolation are discussed. Comparison with standard bag models is made.
ISSN:0556-2813
1089-490X
DOI:10.1103/PhysRevC.72.025804