749 research outputs found
Hybrid star structure with the Field Correlator Method
We explore the relevance of the color-flavor locking phase in the equation of
state (EoS) built with the Field Correlator Method (FCM) for the description of
the quark matter core of hybrid stars. For the hadronic phase, we use the
microscopic Brueckner-Hartree-Fock (BHF) many-body theory, and its relativistic
counterpart, i.e. the Dirac-Brueckner (DBHF). We find that the main features of
the phase transition are directly related to the values of the quark-antiquark
potential , the gluon condensate and the color-flavor
superconducting gap . We confirm that the mapping between the FCM and
the CSS (constant speed of sound) parameterization holds true even in the case
of paired quark matter. The inclusion of hyperons in the hadronic phase and its
effect on the mass-radius relation of hybrid stars is also investigated.Comment: 15 pages, 8 figures ; revised version to be published in the EPJA
Topical Issue on "Exotic Matter in Neutron Stars
Strange hadronic stellar matter within the Brueckner-Bethe-Goldstone theory
In the framework of the non-relativistic Brueckner-Bethe-Goldstone theory, we
derive a microscopic equation of state for asymmetric and -stable matter
containing and hyperons. We mainly study the effects of
three-body forces (TBFs) among nucleons on the hyperon formation and the
equation of state (EoS). We find that, when TBFs are included, the stellar core
is almost equally populated by nucleons and hyperons. The resulting EoS, which
turns out to be extremely soft, has been used in order to calculate the static
structure of neutron stars. We obtain a value of the maximum mass of 1.26 solar
masses (1 solar mass ). Stellar rotations
increase this value by about 12%.Comment: 4 pages, Latex, 2 figures included. To appear in the Proceedings of
'' Bologna 2000 - Structure of the Nucleus at the Dawn of the Century'', May
29- June 3, 2000, Bologna, Ital
- …