Equation of state of neutron star cores and spin down of isolated pulsars |
| |
| Authors: | P Haensel J L Zdunik |
| |
| Institution: | (1) N. Copernicus Astronomical Center, Polish Academy of Sciences, Bartycka 18, PL-00-716 Warsaw, Poland |
| |
| Abstract: | We study possible impact of a softening of the equation of state by a phase transition, or appearance of hyperons, on the
spin evolution of isolated pulsars. Numerical simulations are performed using exact 2-D simulations in general relativity.
The equation of state of dense matter at supranuclear densities is poorly known. Therefore, the accent is put on the general
correlations between evolution and equation of state, and mathematical strictness. General conjectures referring to the structure
of the one-parameter families of stationary configurations are formulated. The interplay of the back bending phenomenon and
stability with respect to axisymmetric perturbations is described. Changes of pulsar parameters in a corequake following instability
are discussed, for a broad choice of phase transitions predicted by different theories of dense matter. The energy release
in a corequake, at a given initial pressure, is shown to be independent of the angular momentum of collapsing configuration.
This result holds for various types of phases transition, with and without metastability. We critically review observations
of pulsars that could be relevant for the detection of the signatures of the phase transition in neutron star cores.
This work was partially supported by the Polish MNiI Grant no. 1P03D-008-27. |
| |
| Keywords: | Dense matter Equation of state Pulsars: general Stars: neutron Stars: rotation |
| 本文献已被 SpringerLink 等数据库收录！ |
|
