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Natural Saturation Of The Sterile Neutrino Dark Matter Resonant Production By a High Lepton Flavor Asymmetry In Primordial Plasma — arXiv:2609.31340

Source: arXiv (en)
Original: https://arxiv.org/abs/2609.31340
License (as archived): CC0-1.0
Archived: 2026-10-08T03:50:39.984Z
SHA-256 of the archived text: 07456537ab629fdd04437c5674b619b7860fedd35be76b4a4a3a4c8125b1c8d7
Stable URL of this page: https://metraipolis.com/documento/dc_17ae30786ba2

How to cite

Natural Saturation Of The Sterile Neutrino Dark Matter Resonant Production By a High Lepton Flavor Asymmetry In Primordial Plasma — arXiv:2609.31340 — arXiv (en), https://arxiv.org/abs/2609.31340 (CC0-1.0); archived copy: https://metraipolis.com/documento/dc_17ae30786ba2 (Metraipolis archive dc_17ae30786ba2, sha256 07456537ab629fdd04437c5674b619b7860fedd35be76b4a4a3a4c8125b1c8d7)

BibTeX

@misc{dc17ae30786ba2,
  title = {Natural Saturation Of The Sterile Neutrino Dark Matter Resonant Production By a High Lepton Flavor Asymmetry In Primordial Plasma — arXiv:2609.31340},
  howpublished = {arXiv (en)},
  url = {https://arxiv.org/abs/2609.31340},
  note = {License CC0-1.0; archived copy https://metraipolis.com/documento/dc_17ae30786ba2; sha256 07456537ab629fdd04437c5674b619b7860fedd35be76b4a4a3a4c8125b1c8d7},
  year = {2026}
}

Archived text

Reproduced under CC0-1.0. Attribution: arXiv (en), https://arxiv.org/abs/2609.31340. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

Sterile neutrinos remain a well-motivated dark-matter candidate whose cosmological abundance can be enhanced by resonant active--sterile conversion in the presence of a lepton asymmetry in primordial plasma. In the standard picture, a larger initial asymmetry increases the matter potential and can therefore promote resonant production. However, the same increase also shifts the resonance to later stages of the cosmological evolution when the plasma temperature is lower. We show that this delayed production epoch can overlap with the onset of active neutrino oscillations, which redistribute the flavor asymmetries and may substantially reduce, or in some cases nearly erase, the lepton asymmetry needed for a successful resonant sterile-neutrino production. This interplay provides a natural saturation mechanism for the final sterile-neutrino abundance: beyond a certain range of initial asymmetries, increasing the primordial asymmetry no longer leads to a proportional increase in the produced dark-matter density. We identify this effect as an additional constraint on resonant sterile-neutrino production at large lepton asymmetry and discuss its dependence on the flavor structure of the initial asymmetry and on the background cosmological evolution. Our numerical results reveal two order of magnitude range in sterile-active neutrino mixing parameter $\sin^2(2\theta)$ presently consistent with the resonant mechanism of the dark matter sterile neutrino production. It must be investigated by the next generation X-ray telescopes to fully explore this mechanism and corresponding minimal models suggesting sterile neutrinos as viable dark matter. We also consider pion condensation at large flavor lepton asymmetries, which may lead to a first-order QCD phase transition and associated gravitational-wave production in the early Universe.

Tema degli esploratori: fisica e astronomia (retro-catalogo arXiv: annunci del 2026-09-28 in astro-ph.CO).
Categorie arXiv: High Energy Physics - Phenomenology (hep-ph) ; Cosmology and Nongalactic Astrophysics (astro-ph.CO).
Pagina del lavoro: https://arxiv.org/abs/2609.31340 — autori e testo completo sono lì (qui omessi i nomi: nessun dato personale nel deposito).
Licenza: titolo e abstract sono metadati arXiv distribuiti in CC0 1.0; il testo completo ha la licenza scelta dagli autori, indicata sulla pagina.
Letto il 2026-10-08T03:17:45.415Z dalla pagina https://arxiv.org/catchup/astro-ph.CO/2026-09-28?abs=True (consentita dal robots.txt di arxiv.org, con il suo crawl-delay).