Energy release associated with a first-order phase transition in a rotating neutron star core

Abstract

We calculate energy release associated with a first order phase transition at the center of a rotating neutron star. The results are based on precise numerical 2-D calculations, in which both the polytropic equations of state (EOS) as well as realistic EOS of the normal phase are used. Presented 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 small radii of the superdense phase core analytical expressions for the energy release are obtained. For a fixed "overpressure" dP (the relative excess of central pressure of collapsing metastable star over the pressure of equilibrium first-order phase transition) the energy release remarkably does not depend on the stellar angular momentum and coincides with that for nonrotating stars with the same dP. The energy release is proportional to dP^2.5 for small dPs, when sufficiently precise brute force 2-D numerical calculations are out of question. For higher dPs, results of 1-D calculations of energy release for non-rotating stars are shown to reproduce, with very high precision, the exact 2-D results for rotating stars.

8 pages, 8 figures, submitted to A&A

References in corpus (5)

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• Gamma Ray Bursts from delayed collapse of neutron stars to quark matter stars
• Phase transitions in rotating neutron stars cores: back bending, stability, corequakes and pulsar timing
• Quantum Nucleation of Two-Flavor Quark Matter in Neutron Stars
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Cited by in corpus (10)

• Spectral Methods for Numerical Relativity
• Finite-size effects at the hadron-quark transition and heavy hybrid stars
• Relativistic simulations of the phase-transition-induced collapse of neutron stars
• Rotating neutron stars with exotic cores: masses, radii, stability
• Lepton effects on the proto-neutron stars with the hadron-quark mixed phase in the Nambu-Jona-Lasinio model
• Hot hadron-quark mixed phase including hyperons
• Strong first-order phase transition in a rotating neutron star core and the associated energy release
• Relativistic hybrid stars with super-strong toroidal magnetic fields: An evolutionary track with QCD phase transition
• Methods for relativistic self-gravitating fluids: From binary neutron stars to black hole-disks and magnetized rotating neutron stars
• Equation of state of neutron star cores and spin down of isolated pulsars