405 research outputs found
Structure and properties of neutron stars in the Relativistic Mean - Field Theory
Properties of rotating neutron stars with the use of relativistic mean-field
theory are considered. The performed analysis of neutron star matter is based
on the nonlinear Lgrangian density. The presence of nonlinear interaction of
vector mesons modifies the density dependence of the rho field and influences
bulk parameters of neutron stars. The observed quasi-periodic X-ray
oscillations of low mass X-ray binaries can be used in order to constrain the
equation of state of neutron star matter. Having assumed that the maximum
frequency of the quasi periodic oscillations originates at the circular orbit
it is possible to estimate masses and radii of neutron stars.Comment: 18 pages, latex2e, 10 colour eps figures, submitted to International
Journal of Modern Physic
The quark strange star in the enlarged Nambu-Jona-Lasinio model
The strange quark star is investigated within the enlarged SU(3)
Nambu-Jona-Lasinio (NJL). The stable quark star exists till maximal
configutation with rho_m=3.1, 10^15, g/cm^3 with M_m=1.61, M_Sun and R_m=8.74,
km is reached. Strange quarks appear for density above rho_c=9.84 g/cm^3 for
the quark star with radius R_c=8.003 km and M_c=0.77, M_Sun. The comparison of
a quark star properties obtained in the Quark Mean Field (QMF) approach to a
neutron star model constructed within the Relativistic Mean Field (RMF) theory
is presented.Comment: 23 pages, iop latex2e + hyperref, 11 figures, to appear in NJ
- …