Lattice QCD Constraints on Hybrid and Quark Stars

Details Lattice QCD Constraints on Hybrid and Quark Stars Lattice QCD Constraints on Hybrid and Quark Stars

2005-01-13

arxiv.org/abs/astro-ph/0501254v2

Phys.Rev. C72 (2005) 025804

Astronomy and Astrophysics

Astrophysics

13 p., 8 figs., 7 tables, Version accepted by Phys. Rev. C

Scientific paper

10.1103/PhysRevC.72.025804

A QCD-motivated dynamical-quasiparticle model with parameters adjusted to reproduce the lattice-QCD equation of state is extrapolated from 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 re discussed. Comparison with standard bag models is made.

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