As is well-known, if the scattering cross section of the Dark Matter (DM) particles off the nuclei inside the Sun is large enough, the Sun can trap DM particles. In principle, the annihilation of DM pair inside the Sun can then lead to the detection of a relatively large flux of neutrinos in the neutrino telescopes. If the annihilation directly produces a neutrino pair, the flux of neutrinos on Earth will be monochromatic. In this case, the oscillatory terms in the oscillation probability lead to a novel seasonal variation of detected events which is sensitive to the initial flavor composition. In this paper, we propose two models that predict such a detectable monochromatic neutrino flux from the DM annihilation. Model I, which is based on augmenting the type II seesaw mechanism, predicts a flavor composition for the monochromatic flux determined by $(m_\nu)_{\alpha \beta}$. In model II, the DM pair first annihilates to a pair of sterile neutrinos which oscillate into active neutrinos with a flavor composition determined by the flavor structure of the active-sterile neutrino mixing.

Flavoring Monochromatic Neutrino Flux from Dark Matter Annihilation

Search for neutrinos from the Sun

Various evidence reveals that dark matter is a primary component of this universe. The amount of dark matter is known, but its identity is a mystery. To determine its properties, efforts to detect and produce dark matter are underway. Dark matter annihilations throughout the galaxy may produce photons, neutrinos, and cosmic rays. Neutrino and photon detectors may then indirectly detect dark matter by detecting these annihilation products. The annihilation rate, dark matter mass, and dark matter scattering rate off of matter affect the signals received at Earth. These signals can therefore probe the identity of dark matter, especially if dark matter is a wellmotivated Weakly Interacting Massive Particle. Another mystery in particle physics is how neutrinos acquire mass. To probe the identity of dark matter, considering only the simplest models may not be wise because there are many mysteries to solve. To consider the mysteries of neutrino mass and the identity of dark matter at the same time is a promising strategy. There are well motivated reasons to tie the two sectors together, and unique signals arise. Three specific results have been obtained. First, the IceCube Neutrino Observatory’s ability to probe the unique annihilation channel to prompt neutrinos that may result when dark matter couples to neutrinos is competitive with direct detection, and is not highly dependent on annihilation rate if detecting neutrinos from dark matter that have been captured by the Sun. Second, detecting the neutrino mass

https://digitalrepository.unm.edu/cgi/viewcontent.cgi?article=1101&context=phyc_etds

Probing Dark Matter-Neutrino Connection via Indirect Detection Experiments

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Probing Dark Matter-Neutrino Connection via Indirect Detection Experiments