6 research outputs found
Small strange stars and marginally stable orbit in Newtonian theory
It is shown that for very rapidly rotating low mass strange stars the
marginally stable orbit is located above the stellar surface. This effect is
explained by the very important role of the oblateness of the rotating strange
star. The comparison with some ``academic'' examples is presented. This feature
is purely Newtonian in its nature and has nothing to do with relativistic
marginally stable orbit. The effect is very large and cannot be treated in a
perturbative way. It seems that strange stars as a very dense self-bound
objects are the only possibility in Nature to represent these toy models.Comment: 4 pages, 5 figures, minor text and Fig.2 changes, references added,
Phys. Rev. D, accepte
Dynamic migration of rotating neutron stars due to a phase transition instability
Using numerical simulations based on solving the general relativistic
hydrodynamic equations, we study the dynamics of a phase transition in the
dense core of isolated rotating neutron stars, triggered by the back bending
instability reached via angular momentum loss. In particular, we investigate
the dynamics of a migration from an unstable configuration into a stable one,
which leads to a mini-collapse of the neutron star and excites sizeable
pulsations in its bulk until it acquires a new stable equilibrium state. We
consider equations of state with softening at high densities, a simple analytic
one with a mixed hadron-quark phase in an intermediate pressure interval and
pure quark matter at very high densities, and a microphysical one that has a
first-order phase transition, originating from kaon condensation. Although the
marginally stable initial models are rigidly rotating, we observe that during
the collapse (albeit little) differential rotation is created. We analyze the
emission of gravitational radiation, which in some models is amplified by mode
resonance effects, and assess its prospective detectability by interferometric
detectors. We expect that the most favorable conditions for dynamic migration
exist in very young magnetars. We find that the damping of the post-migration
pulsations strongly depends on the character of the equation of state
softening. The damping of pulsations in the models with the microphysical
equation of state is caused by dissipation associated with matter flowing
through the density jump at the edge of the dense core. If at work, this
mechanism dominates over all other types of dissipation, like bulk viscosity in
the exotic-phase core, gravitational radiation damping, or numerical viscosity.Comment: 23 pages, 18 figures, minor modification
Deep Crustal Heating in Accreted Neutron Star Crusts Using the Brussels-Montreal HFB-27 * Nuclear Mass Model
X-ray observations of accreting neutron stars in low-mass X-ray binaries have recently proved to be very useful for probing neutron-star interiors. We have recently studied the release of heat due to nonequilibrium nuclear processes in the crust of an accreting neutron star using the microscopic Brussels-Montreal HFB-27* nuclear mass model, based on the self consistent Hartree-Fock-Bogoliubov method. This model was fitted to essentially all atomic masses with a model root mean square deviation of 0.5 MeV. Moreover, the underlying functional was adjusted to realistic equations of state of neutron matter and was constrained to reproduce various properties of nuclear matter.info:eu-repo/semantics/publishe