{
  "abstract": "Low-energy effective theories provide a natural description of four-dimensional physics in higher-dimensional geometries, where the imprint of the bulk geometry appears as parameters of the lower-dimensional theory. Inspired by the Damour-Esposito-Farése (DEF) model of spontaneous scalarization in first generation Scalar-Tensor theories of gravity, we investigate the possibility of tachyonic instability and spontaneous scalarization in braneworld scenarios. We consider the two-brane Randall-Sundrum model where the low-energy effective theory on either brane is of scalar-tensor nature with the extra-dimensional radion playing the role of the scalar. We have determined the possibilities for tachyonic (in)stability of the radion field on either brane in three scenarios: the Randall-Sundrum (RS) model with fine-tuning conditions in which the potential of the radion field vanishes identically, the RS model without fine-tunings where the radion potential arises purely from the gravity sector and the RS model with a bulk stabilizing field that generates a radion potential with a minimum. With the bulk stabilizing field, we have found that on-brane matter with $T>0$ changes the VEV of the radion, destroying the resolution of the gauge hierarchy problem, whereas on-brane matter with $T<0$ does not alter the stability and VEV of the radion. We further determined the exact condition of tachyonic (in)stability of radion field with the on-brane dS$_4$ and AdS$_4$ geometries.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": "Journal reference: APS Open Sci. 1, 000133 (2026)",
  "arxiv": "2605.18403",
  "author_total": 2,
  "authors": [
    {
      "name": "Abhirup Karmakar"
    },
    {
      "name": "Soumitra SenGupta"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/bmqj2wsm2fzan.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2605.18403",
  "fulltext_url": null,
  "id": "bmqj2wsm2fzan",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2605.18403",
  "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-ph"
    ],
    [
      "arxiv",
      "hep-th"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2605.18403",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-17",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/bmqj2wsm2fzan.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:22:19Z",
      "native_id": "2605.18403",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2605.18403"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:gr-qc",
      "subfield": "gravitation"
    },
    {
      "field": "physics",
      "origin": "arxiv:hep-ph",
      "subfield": "high-energy"
    }
  ],
  "title": "Tachyonic (In)stability in Randall-Sundrum Braneworld Scenarios",
  "title_text": "Tachyonic (In)stability in Randall-Sundrum Braneworld Scenarios",
  "type": "preprint",
  "updated_at": "2026-10-30T12:22:19Z",
  "url": "https://research.draconitic.com/paper/bmqj2wsm2fzan",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1103/xv43-tr6m",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}