The energy release--stellar angular momentum independence in rotating compact stars undergoing first-order phase transitions

Details The energy release--stellar angular momentum independence in rotating compact stars undergoing first-order phase transitions The energy release--stellar angular momentum independence in rotating compact stars undergoing first-order phase transitions

2007-10-08

arxiv.org/abs/0710.1528v1

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, proceedings of the International Symposium on Exotic States of Nuclear Matter, EXOCT07, to be published by

Scientific paper

We present the general relativistic calculation of the energy release associated with a first order phase transition (PT) at the center of a rotating neutron star (NS). The energy release, E_rel, is equal to the difference in mass-energies between the initial (normal) phase configuration and the final configuration containing a superdense matter core, assuming constant total baryon number and the angular momentum. The calculations are performed with the use of precise pseudo-spectral 2-D numerical code; the polytropic equations of state (EOS) as well as realistic EOSs (Skyrme interactions, Mean Field Theory kaon condensate) are used. The results are obtained for a broad range of metastability of initial configuration and size of the new superdense phase core in the final configuration. For a fixed ``overpressure'', dP, defined as the relative excess of central pressure of a collapsing metastable star over the pressure of the equilibrium first-order PT, the energy release up to numerical accuracy does not depend on the stellar angular momentum and coincides with that for nonrotating stars with the same dP. When the equatorial radius of the superdense phase core is much smaller than the equatorial radius of the star, analytical expressions for the E_rel can be obtained: E_rel is proportional to dP^2.5 for small dP. At higher dP, the results of 1-D calculations of E_rel(dP) for non-rotating stars reproduce with very high precision exact 2-D results for fast-rotating stars. The energy release-angular momentum independence for a given overpressure holds also for the so-called ``strong'' PTs (that destabilise the star against the axi-symmetric perturbations), as well as for PTs with ``jumping'' over the energy barrier.

Affiliated with

Also associated with

No associations

Rating

The energy release--stellar angular momentum independence in rotating compact stars undergoing first-order phase transitions does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The energy release--stellar angular momentum independence in rotating compact stars undergoing first-order phase transitions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The energy release--stellar angular momentum independence in rotating compact stars undergoing first-order phase transitions will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-544304