{
  "abstract": "Classical general relativity predicts a singularity at the center of every black hole. We argue that it is never reached. We adopt the conjecture of Shaya (2026) that a metric element of non-Lorentzian signature is inadmissible: it cannot enter the Feynman sum over geometries, and so cannot belong to the physical manifold. Nothing beyond standard quantum mechanics is invoked. Signature is the only pointwise diffeomorphism-invariant content of the metric, so the criterion is local and coordinate independent. Transverse-traceless graviton vacuum fluctuations grow as $Δ_g = \\sqrt{8/π}\\,\\ell_P/q$ on a scale $q$, and any finite-scale metric stress driving an eigenvalue through zero removes that element. When the surviving elements can no longer sustain connected, differentiable, causally propagating support, the manifold terminates on a quantum boundary $\\mathcal{B}_Q$ at finite radius. For the vacuum Schwarzschild interior the tidal Weyl stress gives $r_{\\rm qb} \\simeq 1.0\\times10^{-22}(M/M_\\odot)^{1/3}$~m for the adopted curvature response $C_W=0.15$. For a spinning hole, the boundary forms much farther out: mass inflation at the inner horizon $r_{-}$ concentrates an exponentially growing interior mass into a thin layer whose thickness is set by the accretion rate and floored at one spatial quantum, and the counter-streaming null fluxes supply a trace-free Ricci stress along the radial axis alone. This caps the factor $n_{\\rm qb}$ by which mass inflation can amplify the interior mass function, at between $10^{38}$ and $10^{69}$ for a $10\\,M_\\odot$ hole depending on its accretion history, and leaves the Cauchy horizon, the ring, and all deeper extensions outside the physical manifold. The Gibbons--Hawking--York term over this terminal slice yields a finite interior action, $S_{GHY}^{qb} \\approx \\frac{3}{2} n_{\\rm qb} Mc^2\\,Δt$.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2606.15423",
  "author_total": 1,
  "authors": [
    {
      "name": "Edward J. Shaya"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/abcew8wn9txfz.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2606.15423",
  "fulltext_url": null,
  "id": "abcew8wn9txfz",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2606.15423",
  "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"
    ],
    [
      "openalex",
      "3106|Black Holes and Theoretical Physics"
    ]
  ],
  "openalex": "W7164898672",
  "pdf_url": "https://arxiv.org/pdf/2606.15423",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-19",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/abcew8wn9txfz.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:23:19Z",
      "native_id": "2606.15423",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2606.15423"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:gr-qc",
      "subfield": "gravitation"
    }
  ],
  "title": "The Quantum Boundary of Black Hole Interiors: Signature Failure and the Termination of Mass Inflation",
  "title_text": "The Quantum Boundary of Black Hole Interiors: Signature Failure and the Termination of Mass Inflation",
  "type": "preprint",
  "updated_at": "2026-10-30T12:23:19Z",
  "url": "https://research.draconitic.com/paper/abcew8wn9txfz",
  "venue": "arXiv",
  "versions": []
}