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Lyα forest bounds on sterile neutrino production via neutrino self-interactions

Priyank Parashari1,*, Vera Gluscevic1,2,3,†, Yue Zhang4, Simeon Bird5, Mikhail M. Ivanov6,7, and Adam He1

  • *Contact author: ppriyank@usc.edu
  • †Contact author: verag@ias.edu
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Phys. Rev. D 114, 063512 – Published 8 September, 2026

DOI: https://doi.org/10.1103/s1gj-d111

Abstract

Sterile neutrinos in the keV mass range have long been considered a well-motivated dark matter (DM) candidate. In this work, we explore a sterile neutrino production mechanism through active neutrino self-interactions in the early universe, assuming that they constitute the full DM abundance. We implement a self-consistent treatment of the sterile-neutrino free streaming and the active-neutrino self-interactions on structure formation, which yield a unique scale-dependent modification to the linear matter power spectrum. We then set bounds on this scenario using a combination of the cosmic microwave background and Lyα forest constraints. Specifically, we utilize the two recent likelihoods derived from eBOSS data: (i) an effective field theory (EFT) based full-shape likelihood and (ii) a compressed likelihood obtained from the PRIYA-simulation emulator. We produce some of the most stringent observational constraints to date on sterile neutrino DM, comparable to the bounds from the most stringent laboratory constraints.

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Phys. Rev. D 114, 063512– Published 8 September, 2026
  • Received 9 March 2026
  • Accepted 10 August 2026
Article part of CHORUS
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