Monochromatic neutrino lines from sneutrino dark matter

TL;DR

This paper explores the potential to detect monochromatic neutrino lines from sneutrino dark matter annihilation, emphasizing astrophysical sources like dwarf galaxies with black holes to enhance detection prospects.

Contribution

It introduces a search strategy for neutrino lines from sneutrino dark matter, highlighting the role of black holes in boosting signals in dwarf galaxies.

Findings

Monochromatic neutrino lines can be prominent in certain sneutrino dark matter models.

Black holes in dwarf galaxies significantly amplify potential neutrino signals.

Detection of these signals could probe low annihilation cross-sections below current experimental limits.

Abstract

We investigate the possibility of observing monochromatic neutrino lines originating from annihilation of dark matter. We analyse several astrophysical sources with overdensities of dark matter that can amplify the signal. As a case study, we consider mixed left and right handed sneutrino dark matter. We demonstrate that in the physically viable region of the model, one can obtain a prominent monochromatic neutrino line. We propose a search strategy to observe these neutrino lines in future generations of neutrino telescopes that is especially sensitive to dwarf spheroidal galaxies. We demonstrate that the presence of massive black holes in the cores of dwarfs as well as of more massive galaxies substantially boosts any putative signal. In particular, dark matter in dwarf galaxies spiked by IMBH provides a powerful means of probing low annihilation cross-sections well below $10^{-26} \rm cm^3 s^{-1}$ that are otherwise inaccessible by any future direct detection or collider experiment.