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Adiabatic Index of Dense Matter and Damping of Neutron Star Pulsations

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arxiv astro-ph/0208078 v1 pith:CVWNEV5R submitted 2002-08-03 astro-ph

P. Haensel (Copernicus Astronomical Center , Warsaw) , K.P. Levenfish , D.G. Yakovlev (Ioffe Institute , St.-Petersburg) This is my paper · ORCID
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keywords matterdampingpulsationsadiabaticamplitudescompositioncoresdense
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The adiabatic index Gamma_1 for perturbations of dense matter is studied under various physical conditions which can prevail in neutron star cores. The dependence of Gamma_1 on the composition of matter (in particular, on the presence of hyperons), on the stellar pulsation amplitude, and on the baryon superfluidity is analyzed. Timescales of damping of stellar pulsations are estimated at different compositions, temperatures, and pulsation amplitudes. Damping of pulsations by bulk viscosity in the neutron-star cores can prevent the stars to pulsate with relative amplitudes > (1-15)% (depending on the composition of matter).

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Cited by 2 Pith papers

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

  1. White dwarf-neutron star matter transition and the effect of light elements

    nucl-th 2026-08 conditional novelty 5.0 of 10

    A unified relativistic mean-field model connects white dwarfs to neutron stars and finds light-element seeds shift neutron star radii by roughly 0.2 km at 1.4 solar masses.

  2. Bulk viscosity from neutron decays to dark baryons in neutron star matter

    astro-ph.HE 2025-09 conditional novelty 5.0 of 10

    Neutron dark decays modify the equation of state and either mildly suppress or strongly enhance bulk viscosity in neutron star merger conditions, depending on the in-medium decay rate.

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