{
  "abstract": "We construct a realization of sneutrino tribrid inflation within the $R$-symmetric flipped $SU(5)$ grand unified theory. A vector-like pair of matter multiplets, $10_V+\\overline{10}_V$, provides a $D$-flat inflaton direction along the right-handed sneutrino component, with an additional $Z_2$ symmetry forbidding a direct inflaton mass term so that the leading inflationary interaction is a non-renormalizable Kähler-driven operator. Unlike previous studies, we treat the superpotential cutoff scale $M_s$ as independent of the reduced Planck mass, $m_P$, substantially enlarging the viable parameter space. Confronting the model with the ACT DR6/Planck determination $n_s=0.9734\\pm0.0034$ and the $2σ$ bound on the running of the spectral index, we identify broad regions of viable parameter space in which the flipped $SU(5)$ symmetry-breaking scale can approach the conventional GUT scale, $M\\simeq M_{\\rm GUT}$, and the tensor-to-scalar ratio can reach observable values, $r\\gtrsim10^{-3}$, within reach of forthcoming CMB $B$-mode experiment such as LiteBIRD. We further study the post-inflationary dynamics, identifying the inflaton with the lightest right-handed sneutrino in a conventional type-I seesaw sector, whose out-of-equilibrium decay generates a lepton asymmetry that is converted into the observed baryon asymmetry via non-thermal leptogenesis and electroweak sphalerons, for a reheating temperature consistent with both successful leptogenesis and the gravitino constraint.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2608.08708",
  "author_total": 3,
  "authors": [
    {
      "name": "Farishta Israr"
    },
    {
      "name": "Mansoor Ur Rehman"
    },
    {
      "name": "Saleh O. Allehabi"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/2c5qdqvxb04zc.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2608.08708",
  "fulltext_url": null,
  "id": "2c5qdqvxb04zc",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2608.08708",
  "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",
      "hep-ph"
    ],
    [
      "openalex",
      "3103|Cosmology and Gravitation Theories"
    ]
  ],
  "openalex": "W7202160168",
  "pdf_url": "https://arxiv.org/pdf/2608.08708",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-07",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/2c5qdqvxb04zc.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:27:54Z",
      "native_id": "2608.08708",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2608.08708"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ph",
      "subfield": "high-energy"
    }
  ],
  "title": "Sneutrino Tribrid Inflation in Flipped $\\mathbf{SU(5)}$: Confronting ACT DR6 and Planck Observations",
  "title_text": "Sneutrino Tribrid Inflation in Flipped SU(5): Confronting ACT DR6 and Planck Observations",
  "type": "preprint",
  "updated_at": "2026-10-30T12:27:54Z",
  "url": "https://research.draconitic.com/paper/2c5qdqvxb04zc",
  "venue": "arXiv",
  "versions": []
}