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Tremaine-Gunn Control: Evading Bounds on Light Fermion Dark Matter — arXiv:2609.01727

Source: arXiv (en)
Original: https://arxiv.org/abs/2609.01727
License (as archived): CC0-1.0
Archived: 2026-10-17T06:18:19.548Z
SHA-256 of the archived text: 4c3694280166fe1fae0b691fecbbea06efacf8afd0859c475baf80116c60c5ac
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How to cite

Tremaine-Gunn Control: Evading Bounds on Light Fermion Dark Matter — arXiv:2609.01727 — arXiv (en), https://arxiv.org/abs/2609.01727 (CC0-1.0); archived copy: https://metraipolis.com/documento/dc_3182edc19e0e (Metraipolis archive dc_3182edc19e0e, sha256 4c3694280166fe1fae0b691fecbbea06efacf8afd0859c475baf80116c60c5ac)

BibTeX

@misc{dc3182edc19e0e,
  title = {Tremaine-Gunn Control: Evading Bounds on Light Fermion Dark Matter — arXiv:2609.01727},
  howpublished = {arXiv (en)},
  url = {https://arxiv.org/abs/2609.01727},
  note = {License CC0-1.0; archived copy https://metraipolis.com/documento/dc_3182edc19e0e; sha256 4c3694280166fe1fae0b691fecbbea06efacf8afd0859c475baf80116c60c5ac},
  year = {2026}
}

Archived text

Reproduced under CC0-1.0. Attribution: arXiv (en), https://arxiv.org/abs/2609.01727. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

Pauli exclusion is often regarded as imposing a model-independent lower bound on the mass of fermionic dark matter in galaxies. We show that dark-sector interactions can substantially weaken this conclusion. In particular, eV-scale fermions can form bound structures with the characteristic sizes and densities of dwarf galaxies, thereby circumventing the conventional Tremaine-Gunn mass constraint. Within these objects, the degeneracy pressure is balanced by an attractive finite-range scalar Yukawa force that is significantly stronger than gravity. The interaction acts on dwarf-galaxy scales while remaining screened on larger scales. We derive the evolution of the resulting dark-matter fluid and identify a viable cosmological history in which structures first form gravitationally, with the new interaction becoming active only at late times. As a proof of concept, we construct a model in which a single late-time phase transition generates the required dynamics. These results provide a new route to exceptionally light fermionic dark matter and demonstrate that dark-sector interactions can qualitatively alter conventional phase-space limits.

Tema degli esploratori: fisica e astronomia (retro-catalogo arXiv: annunci del 2026-09-03 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/2609.01727 — 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 2026-10-17T05:53:48.014Z dalla pagina https://arxiv.org/catchup/astro-ph.CO/2026-09-03?abs=True (consentita dal robots.txt di arxiv.org, con il suo crawl-delay).