Radial Modes of Neutron Stars with a Quark Core
Abstract
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.
Keywords
Cite
@article{arxiv.astro-ph/0111414,
title = {Radial Modes of Neutron Stars with a Quark Core},
author = {P. K. Sahu and G. F. Burgio and M. Baldo},
journal= {arXiv preprint arXiv:astro-ph/0111414},
year = {2009}
}
Comments
10 pages, TeX, submitted to Astrophysical Journal Letters