{
  "abstract": "We present a family of plateau-type inflationary potentials, eq.~\\eqref{Vgeneral}, and analyze a two-parameter $αβ$-Starobinsky specialization that interpolates continuously between a \\emph{maximal} plateau ($V\\!\\to\\!V_0$) and a \\emph{submaximal} plateau ($V\\!\\to\\!V_\\infty<V_0$), where $V_0$ is the overall scale of the potential. In the $β\\!\\to\\!0$ limit our framework reproduces the $α$-Starobinsky predictions $n_s\\simeq 1-2/N_\\star$ and $r\\simeq 12α/N_\\star^2$. For $β>0$ with $x_\\star\\gg 1/β$ the slow-roll scaling laws change to $n_s\\simeq 1-\\frac{4}{3N_\\star},\\, r\\simeq\\mathcal{C}(α,β)\\,N_\\star^{-4/3},$ with an explicit coefficient $\\mathcal{C}(α,β)$ set by the plateau truncation. This deformation lifts $n_s$ at fixed $N_\\star$ while further suppressing $r$, reconciling the Planck~2018 constraint $n_s=0.9649\\pm0.0042$ (68\\% CL) and BICEP/Keck18 data $r_{0.05}<0.036$ (95\\% CL), with the higher central values $n_s\\sim0.97$--$0.98$ preferred by ACT+DESI~DR2 (BAO), within the theoretically motivated interval $N_\\star\\in(50,60)$ and without exotic reheating. We provide an exact identity for $V/V'$ enabling analytic control of $N_\\star$, a practical crossover criterion $β\\,x_\\star\\ll1$ vs.\\ $\\gg1$, and a transparent mapping between $(α,β)$ and the observables $(n_s,r,N_\\star)$. These yield sharp, testable signatures, particularly the softened $N_\\star$-scaling of $r$, that distinguish a maximal from a submaximal plateau with upcoming CMB and LSS data.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.10991",
  "author_total": 1,
  "authors": [
    {
      "name": "G. German"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/57hyt8nd28s5e.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.10991",
  "fulltext_url": null,
  "id": "57hyt8nd28s5e",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.10991",
  "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",
      "astro-ph.CO"
    ],
    [
      "openalex",
      "3103|Cosmology and Gravitation Theories"
    ]
  ],
  "openalex": "W7212323410",
  "pdf_url": "https://arxiv.org/pdf/2609.10991",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-10",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/57hyt8nd28s5e.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:20:26Z",
      "native_id": "2609.10991",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.10991"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.CO",
      "subfield": "cosmology"
    }
  ],
  "title": "Two-parameter continuous deformation of Starobinsky inflation as a bridge between Planck and ACT DESI data with $N_\\star\\in(50,60)$",
  "title_text": "Two-parameter continuous deformation of Starobinsky inflation as a bridge between Planck and ACT DESI data with N_⋆∈(50,60)",
  "type": "preprint",
  "updated_at": "2026-10-30T12:20:26Z",
  "url": "https://research.draconitic.com/paper/57hyt8nd28s5e",
  "venue": "arXiv",
  "versions": []
}