{
  "abstract": "We demonstrate the complete observation of a black-hole lightring resonance in an optical analogue. To do so, we generalize the concept of the photon sphere to non-stationnary systems by showing that the lightring is associated to a spatiotemporal caustic and that its complex frequency is determined by the propagation and divergence of this caustic. For an optical soliton acting as an analogue black-hole potential, we predict a characteristic spectral plateau whose boundaries are set by the real part of the lightring frequency, while its spectral decay is governed by the imaginary part. Using a pump-probe experiment in a 5-km-long dispersion-shifted fiber, we observe these signatures for two distinct pump wavelengths. The measured spectra agree with numerical simulations and with the predicted lightring-mode profile, providing direct access to both the oscillatory and decay properties of the resonance. Our results establish a direct experimental connection between black-hole lightrings, spacetime caustics, and quasinormal-mode spectroscopy in a dispersive analogue system.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.01706",
  "author_total": 4,
  "authors": [
    {
      "name": "R. Terrier"
    },
    {
      "name": "J. Fatome"
    },
    {
      "name": "B. Kibler"
    },
    {
      "name": "T. Torres"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/3q68fahqw3ppm.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.01706",
  "fulltext_url": null,
  "id": "3q68fahqw3ppm",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.01706",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "gr-qc"
    ],
    [
      "arxiv",
      "physics.optics"
    ],
    [
      "openalex",
      "3106|Black Holes and Theoretical Physics"
    ]
  ],
  "openalex": "W7215725387",
  "pdf_url": "https://arxiv.org/pdf/2610.01706",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-01",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/3q68fahqw3ppm.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:26:03Z",
      "native_id": "2610.01706",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.01706"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:gr-qc",
      "subfield": "gravitation"
    },
    {
      "field": "physics",
      "origin": "arxiv:physics.optics",
      "subfield": "optics-photonics"
    }
  ],
  "title": "Analogue black hole lightring and its resonances in an optical fiber",
  "title_text": "Analogue black hole lightring and its resonances in an optical fiber",
  "type": "preprint",
  "updated_at": "2026-10-30T12:26:03Z",
  "url": "https://research.draconitic.com/paper/3q68fahqw3ppm",
  "venue": "arXiv",
  "versions": []
}