{
  "abstract": "Ringdown gravitational waves probe black hole spacetimes via quasinormal modes (QNMs). Recent studies have reported oscillatory features in QNM-filtered waveforms, and have led to conflicting interpretations as to whether they represent a near-horizon \"direct wave\". Reexamining a particle plunging into a Kerr black hole, we show that the saddle-point approximation underlying the proposed interpretation fails near the horizon. Our exact analysis reveals that every source-induced horizon-mode pole is canceled by an infinite tower of Matsubara zeros, independently of orbital and black-hole parameters. The first four stages of this sequential screening are also confirmed by time-domain numerical integration. Thus, within the near-horizon perturbative framework, source-induced horizon-mode signals do not survive at late times.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.07326",
  "author_total": 4,
  "authors": [
    {
      "name": "Kei-ichiro Kubota"
    },
    {
      "name": "Yusuke Manita"
    },
    {
      "name": "Hayato Motohashi"
    },
    {
      "name": "Daiki Watarai"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/cdjdwkxatdzab.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.07326",
  "fulltext_url": null,
  "id": "cdjdwkxatdzab",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.07326",
  "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-th"
    ],
    [
      "openalex",
      "3103|Pulsars and Gravitational Waves Research"
    ]
  ],
  "openalex": "W7212024393",
  "pdf_url": "https://arxiv.org/pdf/2609.07326",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-07",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/cdjdwkxatdzab.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:19:48Z",
      "native_id": "2609.07326",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.07326"
    }
  ],
  "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-th",
      "subfield": "high-energy"
    }
  ],
  "title": "Exact Cancellation of Horizon Modes in Kerr Ringdown",
  "title_text": "Exact Cancellation of Horizon Modes in Kerr Ringdown",
  "type": "preprint",
  "updated_at": "2026-10-30T12:19:48Z",
  "url": "https://research.draconitic.com/paper/cdjdwkxatdzab",
  "venue": "arXiv",
  "versions": []
}