{
  "abstract": "We revisit accretion of an asymptotically uniform fluid onto a moving Schwarzschild black hole, the relativistic analog of Bondi-Hoyle-Lyttleton accretion. Expanding on previous treatments, we focus on relativistic accretion of stiff fluids with adiabatic indices $Γ\\geq 5/3$, which is particularly relevant for the treatment of primordial black holes captured by neutron stars. We perform numerical simulations to systematically explore the dependence of the steady-state accretion and drag rates on the asymptotic sound speed $a_\\infty$ and relative speed $v_\\infty$, and identify different regimes, both subsonic and supersonic, in which these rates either increase or decrease with respect to the spherical accretion rate for $v_\\infty = 0$. We propose simple analytical approximations that capture the qualitative features observed in the dependence of the accretion and drag rates on $a_\\infty$ and $v_\\infty$.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.12058",
  "author_total": 4,
  "authors": [
    {
      "name": "Elliott Ewell"
    },
    {
      "name": "Peter K. Harris"
    },
    {
      "name": "Thomas W. Baumgarte"
    },
    {
      "name": "Stuart L. Shapiro"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/6e419ngwef2cz.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.12058",
  "fulltext_url": null,
  "id": "6e419ngwef2cz",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.12058",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.HE"
    ],
    [
      "arxiv",
      "gr-qc"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2609.12058",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-10",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/6e419ngwef2cz.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:21:07Z",
      "native_id": "2609.12058",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.12058"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.HE",
      "subfield": "high-energy-astrophysics"
    },
    {
      "field": "physics",
      "origin": "arxiv:gr-qc",
      "subfield": "gravitation"
    }
  ],
  "title": "Accretion onto a moving black hole for stiff equations of state",
  "title_text": "Accretion onto a moving black hole for stiff equations of state",
  "type": "preprint",
  "updated_at": "2026-10-30T12:21:07Z",
  "url": "https://research.draconitic.com/paper/6e419ngwef2cz",
  "venue": "arXiv",
  "versions": []
}