Research demonstrates exclusion limits on dark matter annihilation to neutrinos using direct detection experiments, indicating unresolved cross-section constraints.
Dark matter (DM) could self-annihilate into neutrinos in dense regions of the Universe. We consider the resulting flux of neutrinos from the Milky Way DM halo and derive exclusion limits on the annihilation cross-section using XENONnT electron recoil data. Assuming a J-factor independent of the annihilation cross-section, we find leading limits for DM masses below O(MeV). Self-annihilating DM affects the DM halo via dissolution, introducing a cross-section dependency on the halo profile and thus the J-factor. We discuss such a situation in more detail, finding that the signal rate is below the experimental sensitivity of XENONnT, leaving the annihilation cross-section unconstrained.
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Kamenetskaia et al. (2025) studied this question.
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