{
  "abstract": "For braneworlds with infinite extra dimensions, an analysis of the stability of the characteristic spectrum is essential for understanding their dynamical properties; in this study, we investigate the stability of the gravitational quasinormal-mode (QNM) spectrum of a thick de Sitter braneworld with a noncompact extra dimension, where the unperturbed background supports a localized graviton zero mode and a tower of purely imaginary QNMs. We first reconstruct the response of the warp factor and tensor effective potential to a smooth double-kink deformation of the bulk scalar field, and then introduce a superpotential deformation that parametrizes the resulting double-barrier structure; the deformed frequency-domain spectrum develops QNM pairs with nonzero real parts, and for the representative family studied here, a weak deformation can already generate a complex branch, although the least-damped pole remains purely imaginary in part of the parameter range. In the time domain, the QNM-dominated channel exhibits a transient damped oscillatory stage, whereas the original-potential evolution becomes dominated by the zero-mode sector at late times over the simulated interval. These results identify the double-barrier geometry as the model-specific realization of a more general sensitivity of outgoing, non-self-adjoint spectra, establish a robust model-level mechanism for oscillatory QNM imprints, and provide a dimensionless benchmark for future source-to-detector analyses, while quantitative detector detectability and cosmological-parameter inference require source, response, and noise modeling beyond the present analysis.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2606.04424",
  "author_total": 4,
  "authors": [
    {
      "name": "Hai-Long Jia"
    },
    {
      "name": "Wen-Di Guo"
    },
    {
      "name": "Yun-Tao Gu"
    },
    {
      "name": "Yu-Xiao Liu"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/1xb8h5dkr8zac.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2606.04424",
  "fulltext_url": null,
  "id": "1xb8h5dkr8zac",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2606.04424",
  "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",
      "3103|Cosmology and Gravitation Theories"
    ]
  ],
  "openalex": "W7163565946",
  "pdf_url": "https://arxiv.org/pdf/2606.04424",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-29",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/1xb8h5dkr8zac.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:36:28Z",
      "native_id": "2606.04424",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2606.04424"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:gr-qc",
      "subfield": "gravitation"
    }
  ],
  "title": "Real Part Emergence in Purely Imaginary Quasinormal Modes in Perturbed de Sitter Braneworlds",
  "title_text": "Real Part Emergence in Purely Imaginary Quasinormal Modes in Perturbed de Sitter Braneworlds",
  "type": "preprint",
  "updated_at": "2026-11-01T12:20:47Z",
  "url": "https://research.draconitic.com/paper/1xb8h5dkr8zac",
  "venue": "arXiv",
  "versions": []
}