Gravitational wave content and stability of uniformly, rotating, triaxial neutron stars in general relativity

Antonios Tsokaros, Milton Ruiz, Vasileios Paschalidis, Stuart L. Shapiro, Luca Baiotti, Kōji Uryū

Research output: Contribution to journalArticle

Abstract

Targets for ground-based gravitational wave interferometers include continuous, quasiperiodic sources of gravitational radiation, such as isolated, spinning neutron stars. In this work, we perform evolution simulations of uniformly rotating, triaxially deformed stars, the compressible analogs in general relativity of incompressible, Newtonian Jacobi ellipsoids. We investigate their stability and gravitational wave emission. We employ five models, both normal and supramassive, and track their evolution with different grid setups and resolutions, as well as with two different evolution codes. We find that all models are dynamically stable and produce a strain that is approximately one-tenth the average value of a merging binary system. We track their secular evolution and find that all our stars evolve toward axisymmetry, maintaining their uniform rotation, rotational kinetic energy, and angular momentum profiles while losing their triaxiality.

Original languageEnglish (US)
JournalPhysical Review D
Volume95
Issue number12
DOIs
StatePublished - Jun 15 2017

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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