{
  "abstract": "Matter fields localized around black holes can produce small secondary bumps in the effective potentials governing black-hole perturbations, potentially leading to quasinormal-mode spectral instabilities and late-time echoes. Considering physically motivated models of anisotropic fluids surrounding a spherically symmetric black hole, we show that the appearance of such a secondary bump is accompanied by either singular matter profiles or divergent characteristic speeds in the fluid. These features indicate that the corresponding matter configurations are unphysical. We further demonstrate that a secondary bump in the effective potential does not necessarily imply the existence of additional light rings in the spacetime.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.09284",
  "author_total": 3,
  "authors": [
    {
      "name": "Matteo Della Rocca"
    },
    {
      "name": "Romeo Felice Rosato"
    },
    {
      "name": "Paolo Pani"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/20h5bwrnbb8zn.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.09284",
  "fulltext_url": null,
  "id": "20h5bwrnbb8zn",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.09284",
  "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"
    ],
    [
      "arxiv",
      "hep-ph"
    ],
    [
      "openalex",
      "3106|Black Holes and Theoretical Physics"
    ]
  ],
  "openalex": "W7212181985",
  "pdf_url": "https://arxiv.org/pdf/2609.09284",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-08",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/20h5bwrnbb8zn.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:20:12Z",
      "native_id": "2609.09284",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.09284"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.HE",
      "subfield": "high-energy-astrophysics"
    },
    {
      "field": "physics",
      "origin": "arxiv:gr-qc",
      "subfield": "gravitation"
    },
    {
      "field": "physics",
      "origin": "arxiv:hep-ph",
      "subfield": "high-energy"
    }
  ],
  "title": "Ruling out matter-induced bumps in black-hole effective potentials",
  "title_text": "Ruling out matter-induced bumps in black-hole effective potentials",
  "type": "preprint",
  "updated_at": "2026-10-30T12:20:12Z",
  "url": "https://research.draconitic.com/paper/20h5bwrnbb8zn",
  "venue": "arXiv",
  "versions": []
}