{
  "abstract": "We revisit whether cosmological data require present-day acceleration. We introduce a compact phenomenological parametrization for the equation of state of a separately conserved smooth component, with independently adjustable low- and high-redshift limits and a localized pressure feature of variable location, width, and amplitude. This provides a flexible alternative to CPL-like forms, allowing intermediate-redshift structure in the expansion history to be modelled without tying it rigidly to the high-redshift limit. Embedding this component in a flat Friedmann–Lemaître–Robertson–Walker (FLRW) model with pressureless matter, we test exact present-day coasting and a corresponding free-$q_0$ extension. We fit DESI DR2 BAO, the Planck CMB distance prior, Pantheon + SH0ES Type Ia supernovae, and $f\\sigma _8$, using both the original SN sample and the progenitor-age-corrected form proposed by Son et al. (2025). We find that exact coasting provides a competitive fit once the Son et al. correction is applied and freeing $q_0$ gives only a marginal improvement, so present-day acceleration is not required by this combined data set.",
  "abstract_shown": true,
  "affiliations": [
    "Mathematical Sciences Institute, The Australian National University , Canberra, ACT 2601 ,"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 1,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Lilia Ferrario",
      "orcid": "0000-0002-0485-0518"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/a2nv43vg0dk8q.bib",
  "cited_by": 0,
  "doi": "10.1093/mnras/stag1858",
  "fulltext_url": null,
  "id": "a2nv43vg0dk8q",
  "issns": [
    "1365-2966",
    "0035-8711"
  ],
  "landing_url": "https://academic.oup.com/mnras/article/doi/10.1093/mnras/stag1858/9002813",
  "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/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "feed-journal",
      "astronomy/general"
    ],
    [
      "openalex",
      "3103|Cosmology and Gravitation Theories"
    ]
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  "openalex": "W7224024318",
  "pdf_url": "https://academic.oup.com/mnras/article-pdf/553/1/stag1858/72534090/stag1858.pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-27",
  "publisher": "Oxford University Press (OUP)",
  "ris": "https://research.draconitic.com/paper/a2nv43vg0dk8q.ris",
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    {
      "first_seen": "2026-10-30T12:17:16Z",
      "native_id": "10.1093/mnras/stag1858",
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  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "openalex:3103|Cosmology and Gravitation Theories",
      "subfield": "cosmology"
    }
  ],
  "title": "Present-day coasting in a flat FLRW cosmology with a transient acceleration pocket",
  "title_text": "Present-day coasting in a flat FLRW cosmology with a transient acceleration pocket",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:18:17Z",
  "url": "https://research.draconitic.com/paper/a2nv43vg0dk8q",
  "venue": "Monthly Notices of the Royal Astronomical Society",
  "versions": []
}