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General Relativity and Quantum Cosmology

arXiv:2108.02881 (gr-qc)
[Submitted on 5 Aug 2021 (v1), last revised 15 Dec 2021 (this version, v2)]

Title:Unstable modes of hypermassive compact stars driven by viscosity and gravitational radiation

Authors:Peter B. Rau, Armen Sedrakian
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Abstract:We study the oscillations modes of differential rotating remnants of binary neutron star inspirals by modeling them as incompressible Riemann ellipsoids parametrized by the ratio $f$ of their internal circulation to the rotation frequency. The effects of viscosity and gravitational wave radiation on the modes are studied and it is shown that these bodies exhibit generic instabilities towards gravitational wave radiation akin to the Chandrasekhar--Friedman--Schutz instabilities for uniformly rotating stars. The odd-parity modes are unstable for all values of $f$ (except for the spherical model) and deformations, whereas the even parity unstable modes appear only in highly eccentric ellipsoids. We quantify the modification of the modes with varying mass of the model and the magnitude of the viscosity. The modes are weakly dependent on the range of the masses relevant to the binary neutron star mergers. Large turbulent viscosity can lead to a suppression of the gravitational wave instabilities, whereas kinematical viscosity has a negligible influence on the modes and their damping timescales.
Comments: 16 pages, 11 figures. Submitted to MNRAS
Subjects: General Relativity and Quantum Cosmology (gr-qc); High Energy Astrophysical Phenomena (astro-ph.HE)
Cite as: arXiv:2108.02881 [gr-qc]
  (or arXiv:2108.02881v2 [gr-qc] for this version)
  https://doi.org/10.48550/arXiv.2108.02881
Journal reference: Monthly Notices of the Royal Astronomical Society, Volume 509, 2022, p. 1854-1870
Related DOI: https://doi.org/10.1093/mnras/stab3012

Submission history

From: Peter Rau B [view email]
[v1] Thu, 5 Aug 2021 22:56:42 UTC (3,917 KB)
[v2] Wed, 15 Dec 2021 22:32:35 UTC (8,373 KB)
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