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Radial pulsations and stability of protoneutron stars

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arxiv astro-ph/9705157 v1 pith:V7NYJO53 submitted 1997-05-20 astro-ph

D. Gondek , P. Haensel , J.L. Zdunik This is my paper · ORCID
classification astro-ph
keywords protoneutronradialstarsadiabaticpulsationsstabilitydynamicinterior
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Radial pulsations of newborn neutron stars (protoneutron stars) are studied for a range of internal temperatures and entropies per baryon predicted by the existing numerical simulations. Protoneutron star models are constructed using a realistic equation of state of hot dense matter, and under various assumptions concerning stellar interior (large trapped lepton number, zero trapped lepton number, isentropic, isothermal). Under prevailing conditions, linear oscillations of a protoneutron star can be treated as adiabatic, and evolutionary effects can be neglected on dynamic timescale. The dynamic behavior is governed by the adiabatic index, which in turn depends on the physical state of the stellar interior. The eigenfrequencies of the lowest radial modes of linear, adiabatic pulsations are calculated. Stability of protoneutron stars with respect to small radial perturbations is studied, and the validity of the static stability criteria is 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. Asteroseismology and Universal Relations in Neutron Stars with Gravitationally Bound Dark Matter

    astro-ph.HE 2025-05 conditional novelty 6.0 of 10

    A single-fluid dark matter model makes neutron stars more compact and changes their oscillation spectrum, but the I-Love relation stays almost perfectly robust.

  2. Non-Radial Oscillation Modes in Hybrid Stars with Hyperons and Delta Baryons

    astro-ph.HE 2024-12 conditional novelty 6.0 of 10

    Using full general relativity, the authors compute f-mode oscillation frequencies for neutron stars with hyperons, delta baryons, and quark-matter cores, and find composition-dependent shifts in universal asteroseismo...

  3. Constraining the Nuclear Equation of State of neutron star via high-frequency quasi-periodic oscillation in short gamma-ray bursts

    astro-ph.HE 2025-01 conditional novelty 5.0 of 10

    Applying neutron-star seismology to two short GRB QPOs, the paper shows that neither torsional nor radial oscillation models can distinguish among six candidate equations of state.

  4. Radial oscillations of quark stars in light of current astrophysical constraints: A comparative study

    gr-qc 2026-06 unverdicted novelty 3.0 of 10

    Comparative numerical study of radial modes in strange quark stars using CFL, interacting, and linear causal EOS shows all satisfy current mass-radius bounds and produce 4-7 kHz fundamental frequencies.

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