{
  "abstract": "We study two-flavour neutrino oscillations in which a coherent off-diagonal interaction from a complex background field coexists with an absorptive channel acting on a single mass eigenstate. Since the two do not commute, the effective Hamiltonian is non-normal and oscillations and damping no longer factorise. We formulate the dynamics both as the no-jump sector of a Lindblad evolution and through biorthogonal diagonalisation, and obtain the evolution operator of our model in closed form. The model interpolates between quasi-global damping, standard invisible decay, and a critical point with polynomial-times-exponential evolution; for initially pure states it describes norm loss rather than decoherence. Comparing neutrinos and antineutrinos in the same background, with the mixing phase $ϕ$ reversed and the background phase $δ$ fixed, we derive closed-form $CP$, $CPT$ and $T$ asymmetries. The $CPT$ asymmetries arise only from this phase assignment. In contrast, the $T$ asymmetry, which is forbidden in unitary two-flavour oscillations, is independent of the prescription: it arises only through the non-normal structure, is proportional to the absorptive coupling, and vanishes only when $δ+ϕ=nπ$. For equal initial populations the net neutrino--antineutrino asymmetry vanishes identically, while a non-zero flavour asymmetry survives and requires a non-normal Hamiltonian.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.27091",
  "author_total": 3,
  "authors": [
    {
      "name": "Gabriela Barenboim"
    },
    {
      "name": "Alberto Gago"
    },
    {
      "name": "Eduardo Massoni"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/a60ydddmnjsm5.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.27091",
  "fulltext_url": null,
  "id": "a60ydddmnjsm5",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.27091",
  "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",
      "hep-ph"
    ],
    [
      "openalex",
      "3106|Neutrino Physics Research"
    ]
  ],
  "openalex": "W7223111011",
  "pdf_url": "https://arxiv.org/pdf/2610.27091",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-19",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/a60ydddmnjsm5.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:34:04Z",
      "native_id": "2610.27091",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.27091"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ph",
      "subfield": "high-energy"
    }
  ],
  "title": "Combining Pumping and Absorption Effects in Neutrino Oscillation Probabilities: A Non-Hermitian Framework",
  "title_text": "Combining Pumping and Absorption Effects in Neutrino Oscillation Probabilities: A Non-Hermitian Framework",
  "type": "preprint",
  "updated_at": "2026-10-30T12:34:04Z",
  "url": "https://research.draconitic.com/paper/a60ydddmnjsm5",
  "venue": "arXiv",
  "versions": []
}