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Two-Fluid Radial Stability of Dark-Matter-Admixed Compact Objects: Dark Compact Planets, Dark White Dwarfs, Dark Neutron Stars, and Dark Oysters — arXiv:2610.41082

Source: arXiv (en)
Original: https://arxiv.org/abs/2610.41082
License (as archived): CC0-1.0
Archived: 2026-11-02T08:12:25.095Z
SHA-256 of the archived text: a672165f4db57363a43d46153498a995d54ec2d5b6c0708d45d271e0413550a2
Stable URL of this page: https://metraipolis.com/documento/dc_bb7d633e00a9

How to cite

Two-Fluid Radial Stability of Dark-Matter-Admixed Compact Objects: Dark Compact Planets, Dark White Dwarfs, Dark Neutron Stars, and Dark Oysters — arXiv:2610.41082 — arXiv (en), https://arxiv.org/abs/2610.41082 (CC0-1.0); archived copy: https://metraipolis.com/documento/dc_bb7d633e00a9 (Metraipolis archive dc_bb7d633e00a9, sha256 a672165f4db57363a43d46153498a995d54ec2d5b6c0708d45d271e0413550a2)

BibTeX

@misc{dcbb7d633e00a9,
  title = {Two-Fluid Radial Stability of Dark-Matter-Admixed Compact Objects: Dark Compact Planets, Dark White Dwarfs, Dark Neutron Stars, and Dark Oysters — arXiv:2610.41082},
  howpublished = {arXiv (en)},
  url = {https://arxiv.org/abs/2610.41082},
  note = {License CC0-1.0; archived copy https://metraipolis.com/documento/dc_bb7d633e00a9; sha256 a672165f4db57363a43d46153498a995d54ec2d5b6c0708d45d271e0413550a2},
  year = {2026}
}

Archived text

Reproduced under CC0-1.0. Attribution: arXiv (en), https://arxiv.org/abs/2610.41082. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

We investigate the equilibrium structure and stability against radial oscillations of a variety of two-fluid compact objects containing ordinary baryonic matter admixed with cold dark matter coupled through the background spacetime. For the ordinary fluid, we employ a QCD equation of state compatible with chiral effective field theory at nuclear densities (supplemented by the BPS and Negele-Vautherin models at extremely low densities) and with perturbative QCD in the high-density regime while also satisfying also current astrophysical data. For the dark fluid, we assume self-interacting fermionic matter with particle masses of $m_f=$ 2, 5, 10, and 100 GeV and two self-interaction strengths of $y=0.1$ and $10^3$. By scanning a large range of central pressures for both fluids, we identify the presence of dark compact planets, dark white dwarfs, dark neutron stars and the so-called dark oysters. Importantly, these objects are not only in two-fluid hydrostatic equilibrium, but they are also stable against two-fluid radial oscillations. We find that the relative representation of each class in the radially stable sample is strongly sensitive to the combinations of $m_f$ and $y$, with some combinations entirely suppressing some of these object classes within the sampled domain while favoring others. In addition to these classes, strong self-repulsion supports stable, dark-matter-dominated branches with compact ordinary-matter cores and extended dark halos, approaching the self-interacting fermion-star limit. Finally, we calculate the gravitational redshift at the ordinary-matter surface, $z_{\rm OM}$, including the contribution of extended dark-matter halos for which we found radially stable configurations with $z_{\rm OM}>2$.

Tema degli esploratori: fisica e astronomia (elenco arXiv gr-qc, nuovi lavori del giorno).
Categorie arXiv: High Energy Physics - Phenomenology (hep-ph) ; High Energy Astrophysical Phenomena (astro-ph.HE); Solar and Stellar Astrophysics (astro-ph.SR); General Relativity and Quantum Cosmology (gr-qc); Nuclear Theory (nucl-th).
Pagina del lavoro: https://arxiv.org/abs/2610.41082 — autori e testo completo sono lì (qui omessi i nomi: nessun dato personale nel deposito).
Licenza: titolo e abstract sono metadati arXiv distribuiti in CC0 1.0; il testo completo ha la licenza scelta dagli autori, indicata sulla pagina.
Letto il 2026-11-02T07:50:15.690Z dalla pagina https://arxiv.org/list/gr-qc/new (consentita dal robots.txt di arxiv.org, con il suo crawl-delay).