Relativistic simulations of the phase-transition-induced collapse of neutron stars

Ernazar B. Abdikamalov, Harald Dimmelmeier, Luciano Rezzolla, John C. Miller

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

An increase in the central density of a neutron star may trigger a phase transition from hadronic matter to deconfined quark matter in the core, causing it to collapse to a more compact hybrid star configuration. We present a study of this, building on previous work by Lin et al. We follow them in considering a supersonic phase transition and using a simplified equation of state, but our calculations are general relativistic (using 2D simulations in the conformally flat approximation) as compared with their 3D Newtonian treatment. We also improved the treatment of the initial phase transformation, avoiding the introduction of artificial convection. As before, we find that the emitted gravitational wave spectrum is dominated by the fundamental quasi-radial and quadrupolar pulsation modes but the strain amplitudes are much smaller than suggested previously, which is disappointing for the detection prospects. However, we see significantly smaller damping and observe a non-linear mode resonance which substantially enhances the emission in some cases. We explain the damping mechanisms operating, giving a different view from the previous work. Finally, we discuss the detectability of the gravitational waves, showing that the signal-to-noise ratio for current or second generation interferometers could be high enough to detect such events in our Galaxy, although third generation detectors would be needed to observe them out to the Virgo cluster, which would be necessary for having a reasonable event rate.

Original languageEnglish
Pages (from-to)52-76
Number of pages25
JournalMonthly Notices of the Royal Astronomical Society
Volume392
Issue number1
DOIs
Publication statusPublished - Jan 2009
Externally publishedYes

Fingerprint

phase transition
gravitational waves
neutron stars
damping
wave spectrum
interferometer
equation of state
signal-to-noise ratio
simulation
phase transformations
signal to noise ratios
convection
equations of state
interferometers
actuators
quarks
galaxies
stars
detectors
configurations

Keywords

  • Hydrodynamics
  • Methods: numerical
  • Relativity
  • Stars: neutron
  • Stars: oscillations
  • Stars: rotation

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Relativistic simulations of the phase-transition-induced collapse of neutron stars. / Abdikamalov, Ernazar B.; Dimmelmeier, Harald; Rezzolla, Luciano; Miller, John C.

In: Monthly Notices of the Royal Astronomical Society, Vol. 392, No. 1, 01.2009, p. 52-76.

Research output: Contribution to journalArticle

Abdikamalov, Ernazar B. ; Dimmelmeier, Harald ; Rezzolla, Luciano ; Miller, John C. / Relativistic simulations of the phase-transition-induced collapse of neutron stars. In: Monthly Notices of the Royal Astronomical Society. 2009 ; Vol. 392, No. 1. pp. 52-76.
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