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Lukewarm inflation and the QCD axion — arXiv:2609.19284

Source: arXiv (en)
Original: https://arxiv.org/abs/2609.19284
License (as archived): CC0-1.0
Archived: 2026-10-10T06:05:10.790Z
SHA-256 of the archived text: a35bf5bfc17e08942bffeb96fc47ed3b965558af6f91aa6c577d33ebb35fadf6
Stable URL of this page: https://metraipolis.com/documento/dc_4dbfbb340e24

How to cite

Lukewarm inflation and the QCD axion — arXiv:2609.19284 — arXiv (en), https://arxiv.org/abs/2609.19284 (CC0-1.0); archived copy: https://metraipolis.com/documento/dc_4dbfbb340e24 (Metraipolis archive dc_4dbfbb340e24, sha256 a35bf5bfc17e08942bffeb96fc47ed3b965558af6f91aa6c577d33ebb35fadf6)

BibTeX

@misc{dc4dbfbb340e24,
  title = {Lukewarm inflation and the QCD axion — arXiv:2609.19284},
  howpublished = {arXiv (en)},
  url = {https://arxiv.org/abs/2609.19284},
  note = {License CC0-1.0; archived copy https://metraipolis.com/documento/dc_4dbfbb340e24; sha256 a35bf5bfc17e08942bffeb96fc47ed3b965558af6f91aa6c577d33ebb35fadf6},
  year = {2026}
}

Archived text

Reproduced under CC0-1.0. Attribution: arXiv (en), https://arxiv.org/abs/2609.19284. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

We show that a late period of warm inflation, at temperatures just above the QCD scale, can dilute the abundance of the QCD axion produced by the misalignment mechanism, thus avoiding the need to fine-tune the initial misalignment angle in scenarios with an axion decay constant close to the GUT scale. We develop a concrete realization of this lukewarm inflation stage involving right-handed neutrinos in 0.1 - 1 GeV mass range and an associated scalar sector, showing that coherent axion oscillations are damped during this period. In this scenario, a previously generated large baryon asymmetry may also be diluted to yield the observed value, and lukewarm inflation is followed by an early-matter era dominated by the lightest right-handed neutrino, before it decays into Standard Model states. This model can be tested via changes to the number of relativistic species and the induced small-scale enhancements of the primordial curvature power spectrum, leading to primordial black holes and scalar-induced gravitational waves.

Tema degli esploratori: fisica e astronomia (retro-catalogo arXiv: annunci del 2026-09-18 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/2609.19284 — 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 2026-10-10T05:48:42.755Z dalla pagina https://arxiv.org/catchup/astro-ph.CO/2026-09-18?abs=True (consentita dal robots.txt di arxiv.org, con il suo crawl-delay).