General Relativistic Stability and Gravitational Wave Content of Rotating Triaxial Neutron Stars

Luo, Yufeng; Tsokaros, Antonios; Haas, Roland; Uryū, Kōji

doi:10.3390/sym16030343

Title: General Relativistic Stability and Gravitational Wave Content of Rotating Triaxial Neutron Stars

Journal Article · 12 March 2024 · Symmetry

DOI: https://doi.org/10.3390/sym16030343 · OSTI ID:2323599

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Triaxial neutron stars can be sources of continuous gravitational radiation detectable by ground-based interferometers. The amplitude of the emitted gravitational wave can be greatly affected by the state of the hydrodynamical fluid flow inside the neutron star. In this work, we examine the most triaxial models along two sequences of constant rest mass, confirming their dynamical stability. We also study the response of a triaxial figure of quasiequilibrium under a variety of perturbations that lead to different fluid flows. Starting from the general relativistic compressible analog of the Newtonian Jacobi ellipsoid, we perform simulations of Dedekind-type flows. We find that in some cases the triaxial neutron star resembles a Riemann-S-type ellipsoid with minor rotation and gravitational wave emission as it evolves towards axisymmetry. The present results highlight the importance of understanding the fluid flow in the interior of a neutron star in terms of its gravitational wave content.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0019022

OSTI ID:: 2323599

Journal Information:: Symmetry, Journal Name: Symmetry Journal Issue: 3 Vol. 16; ISSN SYMMAM; ISSN 2073-8994

Publisher:: MDPI AGCopyright Statement

Country of Publication:: Switzerland

Language:: English

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