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  • Open Access

Superheavy supersymmetric dark matter as the origin of the KM3NeT ultrahigh energy signal

Yongsoo Jho1, Seong Chan Park1,2,*, and Chang Sub Shin2,3,4,†

  • *Contact author: sc.park@yonsei.ac.kr
  • †Contact author: csshin@cnu.ac.kr
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Phys. Rev. D 112, 115004 – Published 1 December, 2025

DOI: https://doi.org/10.1103/7jgm-f852

Abstract

We propose an explanation for the recently reported ultrahigh-energy neutrino signal at KM3NeT, which shows no clear association with known astrophysical sources. While decaying dark matter in the Galactic Center is a natural candidate, the observed arrival direction strongly suggests an extragalactic origin. We introduce a multicomponent dark matter scenario in which the components are part of a supermultiplet, with supersymmetry ensuring a nearly degenerate mass spectrum among the fields with different spins. In this setup, a cosmologically long-lived fermionic state decays into a slightly lighter bosonic dark matter state, producing a boosted neutrino spectrum with energy Eν∼100  PeV, determined by the mass difference. The heavy-to-light decay occurs at a cosmological redshift of z∼a few or higher, leading to an isotropic directional distribution of the signal.

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Phys. Rev. D 112, 115004– Published 1 December, 2025
  • Received 14 April 2025
  • Accepted 11 November 2025
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