Neutrino signature of Inert Doublet Dark Matter

TL;DR

This paper investigates neutrino signals from dark matter annihilation within the Inert Doublet Model across different mass ranges, assessing detection prospects via neutrino telescopes and constraints from existing data.

Contribution

It introduces specific neutrino signatures for the Inert Doublet Model, including the impact of an added Majorana neutrino and various mass scenarios, linking theoretical predictions with observational constraints.

Findings

Low mass range (4-8 GeV) can explain DAMA results and WMAP abundance.

Neutrino flux is enhanced around 60-70 GeV due to iron resonance.

Heavy WIMPs may produce detectable neutrino signals if Galactic centre density is boosted.

Abstract

In the framework of the Inert Doublet Model and extensions, the signature of neutrinos from dark matter annihilation in the Earth, the Sun and at the Galactic centre is presented. The model contains an extra Higgs doublet, a neutral component of which is chosen as dark matter candidate. There are three distinct mass ranges for which consistency both with WMAP abundance and direct searches can be obtained: a low (4 - 8 GeV), a middle (60 - 70 GeV) and a high (500 - 1500 GeV) WIMP mass range. The first case is of interest as we showed that the model can at the same time give the correct WMAP abundance and account for the positive DAMA results without contradicting other direct searches. We present how capture in the Sun can further constrain this scenario using Super-Kamiokande data. Indirect detection through neutrinos is challenging for the middle and high mass ranges. For the former, the presence of the so-called 'iron resonance' gives rise to larger neutrino fluxes for WIMP masses around 60 - 70 GeV since capture by the Earth is enhanced. The addition of light right-handed Majorana neutrinos to the particle content of the model further increases the signal since it opens a direct annihilation channel into mono-energetic neutrinos. Neutrinos from the Galactic centre might be detected for heavy WIMPs if the dark matter density at the Galactic centre is substantially boosted.