Radial Modes of Neutron Stars with a Quark Core

Details Radial Modes of Neutron Stars with a Quark Core Radial Modes of Neutron Stars with a Quark Core

2001-11-21

arxiv.org/abs/astro-ph/0111414v1

Astrophys.J. 566 (2002) L89-L92

Astronomy and Astrophysics

Astrophysics

10 pages, TeX, submitted to Astrophysical Journal Letters

Scientific paper

10.1086/339510

We make a first calculation of eigenfrequencies of radial pulsations of neutron stars with quark cores in a general relativistic formalism given by Chandrasekhar. The equations of state (EOS) used to estimate such eigenfrequencies have been derived by taking proper care of the hadron-quark phase transition. The hadronic EOS's have been obtained in the framework of the Brueckner-Hartree-Fock and relativistic mean field theories, whereas the quark EOS has been derived within the MIT bag model. We find that the periods of oscillations of neutron stars with a quark core show a kink, which is associated with the presence of a mixed phase region. Also, oscillation periods show significant differences between ordinary neutron stars and neutron stars with dynamical quark phases.

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