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Loop Dominated Signals from Neutrino Portal Dark Matter
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We study scenarios where loop processes give the dominant contributions to dark matter decay or annihilation despite the presence of tree level channels. We illustrate this possibility in a specific model where dark matter is part of a hidden sector that communicates with the Standard Model sector via a heavy neutrino portal. We explain the underpinning rationale for how loop processes mediated by the portal neutrinos can parametrically dominate over tree level decay channels, and demonstrate that this qualitatively changes the indirect detection signals in positrons, neutrinos, and gamma rays.
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Cited by 2 Pith papers
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Cosmological Histories in Neutrino Portal Dark Matter
A neutrino portal dark sector with mN < mχ < mϕ can be populated by freeze-out, freeze-in, double freeze-in, or by forming a separate cold dark thermal bath, depending on the two portal couplings.
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Illuminating Very Heavy Dark Matter in the Earth with Tau Neutrinos
Tau neutrino regeneration lets IceCube constrain dark matter annihilation in Earth's core for masses from 10^5 to 10^10 GeV, setting new upper limits on the spin-independent scattering cross section.
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