{
  "abstract": "We investigate why changing the heavy-neutrino mass hierarchy can reverse the baryon asymmetry in nonthermal leptogenesis after hilltop inflation. Along the mass trajectory studied here, lowering the mass of the lighter state, \\(N_1\\), reverses the final asymmetry while leaving the dominant injection from \\(N_2\\) decays nearly unchanged. The mass change primarily delays \\(N_1\\) washout relative to electron--muon flavor decoherence; at fixed source and background, translating the washout history while preserving its shape and integrated strength reproduces more than 99\\% of the yield changes from the nonthermal \\(N_2\\) source at two physical target masses. Decomposing the \\(N_2\\) CP source shows that the projector-aligned component remains positive under both washout histories, whereas the initially trace-free component reverses its propagated contribution and accounts for about 99.7\\% of the timing contrast in the fixed-source comparison. Rapid damping of \\(eμ\\) flavor coherence largely removes this contrast, while rapid chemical equilibration does not. Later washout therefore acts on a more decohered flavor state, reducing the positive \\(eμ\\) contribution and allowing negative diagonal contributions to determine the final sign. At a mass recomputed to reproduce the observed baryon yield, a 10\\% increase of the muon collision operator reverses the sign in a fixed-input sensitivity test.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.08175",
  "author_total": 2,
  "authors": [
    {
      "name": "Boliang Yu"
    },
    {
      "name": "Ruixin Zhou"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/0p23r94w9z1bv.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.08175",
  "fulltext_url": null,
  "id": "0p23r94w9z1bv",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.08175",
  "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"
    ],
    [
      "arxiv",
      "hep-ph"
    ],
    [
      "openalex",
      "3106|Particle physics theoretical and experimental studies"
    ]
  ],
  "openalex": "W7220912613",
  "pdf_url": "https://arxiv.org/pdf/2610.08175",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-06",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/0p23r94w9z1bv.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:27:22Z",
      "native_id": "2610.08175",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.08175"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.CO",
      "subfield": "cosmology"
    },
    {
      "field": "physics",
      "origin": "arxiv:hep-ph",
      "subfield": "high-energy"
    }
  ],
  "title": "Flavor decoherence and washout timing in nonthermal leptogenesis after inflation",
  "title_text": "Flavor decoherence and washout timing in nonthermal leptogenesis after inflation",
  "type": "preprint",
  "updated_at": "2026-10-30T12:27:22Z",
  "url": "https://research.draconitic.com/paper/0p23r94w9z1bv",
  "venue": "arXiv",
  "versions": []
}