{
  "abstract": "We compute the normal mode spectrum and its spectral form factor for a probe scalar wave in smooth horizonless backgrounds. We first consider the BTZ black hole with a brickwall that hides the near-horizon region, which has recently been proposed as a toy model for a finite-temperature semiclassical black hole microstate. In this setup, the spectral form factor may or may not have a linear ramp, depending on the details of the brickwall construction. However, we argue that even in cases that do show a ramp, this ramp does not originate from level correlations associated with quantum chaos. Then we calculate the normal mode spectrum for a genuine microstate geometry (superstratum) and find evidence of chaos, both with a ramp and level repulsion. We conclude that the eigenvalue spectrum of normal modes can indeed serve as a tool for investigating the quantum dynamics of fuzzballs; however, the brickwall models are incapable of capturing this phenomenon.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.37038",
  "author_total": 5,
  "authors": [
    {
      "name": "A. I. Belokon"
    },
    {
      "name": "M. Čubrović"
    },
    {
      "name": "V. Đukić"
    },
    {
      "name": "V. V. Pushkarev"
    },
    {
      "name": "L. Umrikhin"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/2napmzr7r0zpr.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.37038",
  "fulltext_url": null,
  "id": "2napmzr7r0zpr",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.37038",
  "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",
      "gr-qc"
    ],
    [
      "arxiv",
      "hep-th"
    ],
    [
      "arxiv",
      "nlin.CD"
    ],
    [
      "openalex",
      "3106|Black Holes and Theoretical Physics"
    ]
  ],
  "openalex": "W7224082806",
  "pdf_url": "https://arxiv.org/pdf/2610.37038",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-27",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/2napmzr7r0zpr.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:35:50Z",
      "native_id": "2610.37038",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.37038"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:gr-qc",
      "subfield": "gravitation"
    },
    {
      "field": "physics",
      "origin": "arxiv:hep-th",
      "subfield": "high-energy"
    },
    {
      "field": "physics",
      "origin": "arxiv:nlin.CD",
      "subfield": "statistical-nonlinear"
    }
  ],
  "title": "Another Brick in the Wall: Spectral Form Factor of Normal Modes in Horizonless Geometries",
  "title_text": "Another Brick in the Wall: Spectral Form Factor of Normal Modes in Horizonless Geometries",
  "type": "preprint",
  "updated_at": "2026-10-30T12:35:50Z",
  "url": "https://research.draconitic.com/paper/2napmzr7r0zpr",
  "venue": "arXiv",
  "versions": []
}