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Neutron Star Crust Can Support A Large Ellipticity

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arxiv 2209.03222 v2 pith:N53JSGTB submitted 2022-09-07 gr-qc astro-ph.HEnucl-th

classification gr-qcastro-ph.HEnucl-th
keywords continuouscrustellipticitygravitationalneutrondeformationsgittinsmaximum
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abstract

Non-axisymmetrical deformations of the crust on rapidly rotating neutron stars are one of the main targets of searches for continuous gravitational waves. The maximum ellipticity, or fractional difference in moments of inertia, that can be supported by deformations of the crust (known as "mountains") provides an important upper limit on the strength of these continuous gravitational wave sources. We use the formalism of Gittins et al 2021, along with a deforming force that acts mainly in the transverse direction, to obtain a maximum ellipticity of 7.4$\times$10$^{-6}$. This is larger than the original results of Gittins et al 2021 but consistent with earlier calculations by Ushomirsky et al 2000. This suggests that rotating neutron stars could be strong sources of continuous gravitational waves.

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Forward citations

Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. LIGO A$^\sharp$: Detector Design and Science Prospects Beyond A+

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    astro-ph.IM 2026-07 accept novelty 6.0 of 10

    Degrading the Einstein Telescope's sensitivity in specific frequency bands hurts different science goals in predictable ways, but the mission remains scientifically strong even in the worst modelled cases.

  3. Search for continuous gravitational waves from the pulsar J0435+3233

    gr-qc 2026-07 accept novelty 6.0 of 10

    A LIGO O4a search for continuous gravitational waves from millisecond pulsar J0435+3233 finds no signal, setting h0<5.8×10^-27 at 95% confidence and an ellipticity limit of 1.6×10^-8.

  4. Galactic double neutron stars as dual-line gravitational-wave sources: Prospects with LISA and Cosmic Explorer

    gr-qc 2025-05 conditional novelty 5.0 of 10

    A Monte Carlo population forecast predicts 6 to 22 spinning neutron star components in LISA-detectable double neutron stars will be detectable by Cosmic Explorer, with a moment-of-inertia accuracy near 8%.

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