{
  "abstract": "We study the near-horizon charged-scalar instability associated with Schwinger pair production in the charged regular black hole geometry of the zero-point-length T-duality prescription. Using the same effective geometry and regularized gauge potential, we construct the extremal branch, its ${\\rm AdS}_2 \\times S^2$ near-horizon throat, and the charged-scalar instability threshold for a general form factor. For the explicit T-duality form factor the extremal branch terminates at $r_\\mathrm{ext} = \\sqrt2 \\, l_0$, where the extremal charge and the near-horizon electric field vanish while the ${\\rm AdS}_2$ radius remains finite at $\\sqrt3 \\, l_0$. At this endpoint the exact near-horizon instability parameter is negative. In the semiclassical regime the corresponding charge-to-mass threshold diverges as the endpoint is approached. Thus, for each fixed massive species with finite $q/m$, a sufficiently near-endpoint portion of the extremal branch is free of the local charged-scalar instability. For comparison, the Ayón-Beato-García (ABG) Einstein-nonlinear-electrodynamics solution has a nonvanishing extremal near-horizon electric field. For an additional minimally coupled charged-scalar probe, the corresponding local Schwinger threshold remains finite. Thus the divergent near-endpoint Schwinger barrier found in the T-duality branch is not a generic consequence of regularity.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.18528",
  "author_total": 3,
  "authors": [
    {
      "name": "Chiang-Mei Chen"
    },
    {
      "name": "Kimet Jusufi"
    },
    {
      "name": "Douglas Singleton"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/e89k5g74281e5.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.18528",
  "fulltext_url": null,
  "id": "e89k5g74281e5",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.18528",
  "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",
      "hep-th"
    ],
    [
      "openalex",
      "3106|Black Holes and Theoretical Physics"
    ]
  ],
  "openalex": "W7213509755",
  "pdf_url": "https://arxiv.org/pdf/2609.18528",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-16",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/e89k5g74281e5.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:22:01Z",
      "native_id": "2609.18528",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.18528"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:gr-qc",
      "subfield": "gravitation"
    },
    {
      "field": "physics",
      "origin": "arxiv:hep-th",
      "subfield": "high-energy"
    }
  ],
  "title": "Schwinger stability of T-duality-inspired extremal black holes",
  "title_text": "Schwinger stability of T-duality-inspired extremal black holes",
  "type": "preprint",
  "updated_at": "2026-10-30T12:22:01Z",
  "url": "https://research.draconitic.com/paper/e89k5g74281e5",
  "venue": "arXiv",
  "versions": []
}