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Dark Matter Annihilation to Neutrinos
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abstract
We review the annihilation of dark matter into neutrinos over a range of dark matter masses from MeV$/c^2$ to ZeV$/c^2$. Thermally-produced models of dark matter are expected to self-annihilate to standard model products. As no such signal has yet been detected, we turn to neutrino detectors to constrain the ``most invisible channel.'' We review the experimental techniques that are used to detect neutrinos, and revisit the expected contributions to the neutrino flux at current and upcoming neutrino experiments. We place updated constraints on the dark matter self-annhilation cross section to neutrinos $\langle \sigma v \rangle$ using the most recently available data, and forecast the sensitivity of upcoming experiments such as Hyper-Kamiokande, DUNE, and IceCube Gen-2. Where possible, limits and projections are scaled to a single set of dark matter halo parameters for consistent comparison. We consider Galactic and extragalactic signals of $s$, $p$, and $d$-wave annihilation processes directly into neutrino pairs, yielding constraints that range from $\langle \sigma v \rangle \sim 2.5\times10^{-26}~{\rm cm}^3 {\rm s}^{-1}$ at 30 MeV$/c^2$ to $10^{-17}~{\rm cm}^3{\rm s}^{-1}$ at 10$^{11}$ GeV$/c^2$. Experiments that report directional and energy information of their events provide much stronger constraints, outlining the importance of making such data public.
Forward citations
Cited by 6 Pith papers
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Inelastic Scattering Effects on Attenuation of Boosted Dark Matter
Resonant excitation of nucleons into Δ(1232) during Earth passage is a non-negligible attenuation channel for boosted dark matter at E_χ ≈ 1–2 GeV, lowering the PandaX-4T upper bound on σ̄_n in the heavy-mediator regime.
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Search for GeV-scale Dark Matter from the Galactic Center with IceCube-DeepCore
Using 9.28 years of IceCube-DeepCore data, no dark-matter neutrino signal is found from the Galactic Center, setting the strongest neutrino-telescope limits for GeV-scale annihilation and decay.
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Search for High-Energy Neutrinos From the Sun Using Ten Years of IceCube Data
No dark matter neutrinos from the Sun appear in ten years of IceCube data, so the collaboration sets new world-leading upper limits on high-mass spin-dependent dark matter-nucleon scattering and on solar atmospheric n...
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New Constraints on Neutrino-Dark Matter Interactions: A Comprehensive Analysis
Most benchmark neutrino-dark matter couplings adopted in previous studies are excluded when laboratory meson and Z decay bounds are combined with cosmological and astrophysical constraints, leaving only special galact...
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Neutrino lines and photon continua from cascade dark matter decay
In cascade dark-matter decay, neutrino-line searches can beat gamma-ray limits whenever the intermediate mediator is long-lived enough to suppress the photon flux.
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Constraining the Coexistence of Primordial Black Holes and Particle Dark Matter with Neutrino Observations
A refined halo model turns neutrino-telescope data into upper limits on the primordial-black-hole fraction f_PBH, reaching ~10^-8 in some mass ranges for mixed WIMP/FIMP scenarios.
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