{
  "abstract": "The JWST/NEXUS survey has reported a candidate young transient, AT 2026abck, at redshift : the rest-frame time from the last non-detection to the discovery is less than about 12 days, and the authors estimate that it was observed about 4–10 rest-frame days after explosion; model fits give a temperature of about 17,000 K and a radius of about 46 AU, overall supporting a core-collapse supernova candidate. This paper does not reject that classical interpretation. Instead, it raises a conceptual question: to what physical quantity does the \"apparent superluminal number\" constructed from a cosmological distance and an event timescale actually belong? Standard cosmology first requires distinguishing a distance–time ratio from a material expansion velocity; the Spacetime Ladder Theory (STLT) further proposes that such an apparent superluminal quantity can serve as a candidate observable of projections from different hierarchical levels of spacetime. This paper makes clear that: the material-end expansion velocity remains below ; the apparent distance–time ratio is used only to construct a phenomenological scale; and the three-tier velocity spectrum of STLT is a theoretical hypothesis, not a result measured from this single event. On this basis, the paper proposes a search scheme for \"higher-level spacetime perturbations\" (HLSPs) and gives falsifiable conditions based on multi-messenger time delays, non-tensor polarizations, and independent transient events. AT 2026abck therefore serves as a methodological case study, not as proof of the existence of a dark-matter layer.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": null,
  "author_total": 1,
  "authors": [
    {
      "name": "binggong chang",
      "orcid": "0000-0003-1415-5030"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/9j1p1nf0zhvz8.bib",
  "cited_by": 0,
  "doi": "10.5281/zenodo.23456198",
  "fulltext_url": null,
  "id": "9j1p1nf0zhvz8",
  "issns": [],
  "landing_url": "https://zenodo.org/records/23456198",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
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  "pdf_url": "https://zenodo.org/api/records/23456198/files/A%20Phenomenological%20STLT%20Case%20Study%20of%20AT%202026abck.pdf/content",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-18",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/9j1p1nf0zhvz8.ris",
  "sources": [
    {
      "first_seen": "2026-11-01T12:21:00Z",
      "native_id": "23456198",
      "source": "zenodo",
      "url": "https://zenodo.org/records/23456198"
    }
  ],
  "subjects": [],
  "title": "Apparent Superluminal Scales and Hierarchical Spacetime: A Phenomenological STLT Case Study of AT 2026abck",
  "title_text": "Apparent Superluminal Scales and Hierarchical Spacetime: A Phenomenological STLT Case Study of AT 2026abck",
  "type": "preprint",
  "updated_at": "2026-11-01T12:21:00Z",
  "url": "https://research.draconitic.com/paper/9j1p1nf0zhvz8",
  "venue": "Zenodo",
  "versions": []
}