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Neutrinophilic super-resonant dark matter

Murat Abdughani1,*, Shao-Song Tang1,†, Kadirya Tursun2,‡, and Bin Zhu3,§

  • *Contact author: mulati@xju.edu.cn
  • †Contact author: 107552300734@stu.edu.cn
  • ‡Contact author: kadirya@xao.ac.cn
  • §Contact author: zhubin@mail.nankai.edu.cn
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Phys. Rev. D 112, 095047 – Published 26 November, 2025

DOI: https://doi.org/10.1103/ft2b-6y3d

Abstract

Dark matter (DM) annihilation can be significantly enhanced through narrow resonances or the Sommerfeld enhancement effect, with both mechanisms potentially combining in a super-resonant annihilation process. In such scenarios, the conventional assumption that kinetic equilibrium persists until chemical decoupling may not hold, leading to substantial impacts on the final DM relic density. However, a strongly enhanced annihilation cross section into Standard Model particles, except neutrinos, is constrained by cosmic microwave background observations. We thus investigate DM annihilation into neutrino pair final states, focusing on the role of kinetic decoupling. We solve the coupled Boltzmann equations to determine the relic density and constrain the parameter space using current experimental data, while also forecasting the sensitivity of future experiments.

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Information

Phys. Rev. D 112, 095047– Published 26 November, 2025
  • Received 24 May 2025
  • Accepted 11 November 2025
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