{
  "abstract": "We constrain the class of modified cosmologies derived in Paper I [1] from a generalized mass-to-horizon relation (MHR) that enforces thermodynamic consistency between the Cai-Kim horizon temperature and generalized horizon entropies. The modified Friedmann equations depend on an entropy exponent $m$, an MHR coupling parameter $γ$, and an entanglement-correction amplitude $f_B$, with standard $Λ$CDM recovered in the appropriate limit. Using Pantheon$+$/SH0ES Type~Ia supernovae, cosmic chronometers, DESI DR2 baryon acoustic oscillations, and Planck 2018 CMB distance priors, we constrain eight physically motivated sub-cases via Markov chain Monte Carlo and compare models through the Bayesian log-evidence. The entropy exponent is tightly bounded, $|m-1|\\lesssim O(10^{-4})$ when the MHR coupling is fixed ($γ=1$), relaxing to $O(10^{-3})$ along the $m$-$γ$ degeneracy, excluding any macroscopically significant departure from standard horizon thermodynamics. Freeing the MHR coupling parameter or the entanglement amplitude raises the inferred Hubble constant to $h\\simeq0.70$-$0.71$, reducing the CMB-SH0ES tension from ${\\sim}4σ$ to ${\\sim}1.2$-$2.6σ$, but no scenario fully resolves it within a flat universe. The Bayesian log-evidence nevertheless disfavors every extension relative to $Λ$CDM in all dataset combinations ($-16\\lesssimΔ\\ln Z \\lesssim-1$): the improved fits obtained when the SH0ES calibration is included reflect an absorption of the Hubble tension by the additional parameters rather than genuine evidence for modified horizon entropy.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": "Journal reference: JCAP10(2026)055",
  "arxiv": "2607.18521",
  "author_total": 3,
  "authors": [
    {
      "name": "Pranav Prasanthan"
    },
    {
      "name": "Hussain Gohar"
    },
    {
      "name": "Vincenzo Salzano"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/0d2jdkcdvpg7k.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2607.18521",
  "fulltext_url": null,
  "id": "0d2jdkcdvpg7k",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2607.18521",
  "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",
      "astro-ph.CO"
    ],
    [
      "arxiv",
      "gr-qc"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2607.18521",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-24",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/0d2jdkcdvpg7k.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:35:35Z",
      "native_id": "2607.18521",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2607.18521"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.CO",
      "subfield": "cosmology"
    },
    {
      "field": "physics",
      "origin": "arxiv:gr-qc",
      "subfield": "gravitation"
    }
  ],
  "title": "Modified Cosmology from Mass-to-Horizon Relation: Observational Bounds",
  "title_text": "Modified Cosmology from Mass-to-Horizon Relation: Observational Bounds",
  "type": "preprint",
  "updated_at": "2026-10-30T12:35:35Z",
  "url": "https://research.draconitic.com/paper/0d2jdkcdvpg7k",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1088/1475-7516/2026/10/055",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}