{
  "abstract": "A bstract : We study the quantum chaos bound in the photon ring region surrounding black holes. By evaluating the Lyapunov exponent associated with unstable null geodesics in a broad class of generalized Kerr geometries, as well as the temperature induced by a string probe, we show that the quantum chaos bound is exactly saturated on equatorial circular orbits of the photon ring. We confirm our result by deriving the same exponent from out-of-time-order correlators in the near ring region. As a byproduct, we show that the photon ring saturation of the quantum chaos bound implies the saturation of the Bekenstein bound on the rate of information emission from the ringdown phase through the quasinormal modes in the eikonal limit. Our results extend the known correspondence between black hole thermodynamics and chaotic dynamics, highlighting the role of the photon ring as a probe of the fundamental limits on thermalization and information scrambling in black holes.",
  "abstract_shown": true,
  "affiliations": [
    "National Sun Yat-sen University",
    "Physics Division, National Center for Theoretical Sciences",
    "New York University Abu Dhabi",
    "Theoretical Physics Department, CERN",
    "National Technical University of Athens",
    "University of Cambridge",
    "University of Geneva",
    "INFN, Sezione di Roma"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 5,
  "authors": [
    {
      "affs": [
        0,
        1
      ],
      "name": "D. Giataganas",
      "orcid": "0000-0003-2003-3902"
    },
    {
      "affs": [
        2,
        3
      ],
      "name": "G. F. Giudice",
      "orcid": "0000-0002-0247-4096"
    },
    {
      "affs": [
        4
      ],
      "name": "A. Kehagias",
      "orcid": "0000-0001-6080-6215"
    },
    {
      "affs": [
        2,
        5
      ],
      "name": "F. Quevedo",
      "orcid": "0000-0002-7810-3662"
    },
    {
      "affs": [
        6,
        7
      ],
      "name": "A. Riotto",
      "orcid": "0000-0001-6948-0856"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/76zkepvdg8sv1.bib",
  "cited_by": 0,
  "doi": "10.1007/jhep10(2026)184",
  "fulltext_url": null,
  "id": "76zkepvdg8sv1",
  "issns": [
    "1029-8479"
  ],
  "landing_url": "https://link.springer.com/article/10.1007/JHEP10(2026)184",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "3106|Black Holes and Theoretical Physics"
    ]
  ],
  "openalex": "W7162771231",
  "pdf_url": "https://link.springer.com/content/pdf/10.1007/JHEP10(2026)184.pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-16",
  "publisher": "Springer Science and Business Media LLC",
  "ris": "https://research.draconitic.com/paper/76zkepvdg8sv1.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:01Z",
      "native_id": "10.1007/jhep10(2026)184",
      "source": "crossref",
      "url": "https://link.springer.com/article/10.1007/JHEP10(2026)184"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "openalex:3106|Black Holes and Theoretical Physics",
      "subfield": "high-energy"
    }
  ],
  "title": "Black hole photon rings saturate the quantum chaos bound",
  "title_text": "Black hole photon rings saturate the quantum chaos bound",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:18:01Z",
  "url": "https://research.draconitic.com/paper/76zkepvdg8sv1",
  "venue": "Journal of High Energy Physics",
  "versions": []
}