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The spin parameter of uniformly rotating compact stars

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arxiv 1011.3563 v2 pith:OOSUD3I4 submitted 2010-11-16 astro-ph.HE gr-qc

Ka-Wai Lo , Lap-Ming Lin This is my paper · ORCID
classification astro-ph.HEgr-qc
keywords starparameterspinmassneutronrotatingstarsbound
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abstract

We study the dimensionless spin parameter $j (= c J/ (G M^2))$ of uniformly rotating neutron stars and quark stars in general relativity. We show numerically that the maximum value of the spin parameter of a neutron star rotating at the Keplerian frequency is $j_{\rm max} \sim 0.7$ for a wide class of realistic equations of state. This upper bound is insensitive to the mass of the neutron star if the mass of the star is larger than about $1 M_\odot$. On the other hand, the spin parameter of a quark star modeled by the MIT bag model can be larger than unity and does not have a universal upper bound. Its value also depends strongly on the bag constant and the mass of the star. Astrophysical implications of our finding will be discussed.

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Cited by 4 Pith papers

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

  1. Quadrupole and quadratic-in-spin effects in quasicircular, spinning, asymmetric binaries

    gr-qc 2026-06 unverdicted novelty 7.0 of 10

    Calculates energy fluxes with quadratic-in-spin and quadrupole effects for small-mass-ratio spinning binaries in self-force theory, providing numerical data and sixth-order PN expansions.

  2. The macroscopic precession model of quasi-periodic oscillations for rotating compact objects

    gr-qc 2026-07 conditional novelty 6.0 of 10

    Treating QPO-emitting disk clumps as spinning test bodies reproduces the observed twin kHz QPOs without the effective de Sitter term, with fits preferring n≈2 thin-disk structures for Schwarzschild and n≈1 for Kerr.

  3. nmma: An extended Bayesian framework for Nuclear Multimessenger Astronomy in the Era of Next-Generation Detectors

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

    nmma now jointly samples nuclear EoS parameters with GW and EM data via TOV emulators and Fiesta surrogates, delivering 20–60× speedups and future H0–nuclear constraints.

  4. Generalizing the relativistic precession model of quasi-periodic oscillations through anharmonic corrections

    gr-qc 2025-04 conditional novelty 5.0 of 10

    Adding a quadratic radial correction changes the predicted lower QPO frequency near the ISCO, but fits to eight neutron stars show it is insufficient to rescue the relativistic precession model.

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