Neutrino Signals from Gravitino Dark Matter with Broken R-Parity

TL;DR

This paper explores the potential for detecting neutrino signals from decaying gravitino dark matter with broken R-parity, analyzing decay processes and assessing detection feasibility in current and future experiments.

Contribution

It provides detailed calculations of gravitino decay widths with R-parity violation and evaluates the prospects of neutrino detection as evidence for this dark matter scenario.

Findings

Neutrino signals from gravitino decay are potentially detectable with advanced experiments.

Decaying gravitino dark matter remains consistent with cosmological constraints.

Detection of such signals could support the decaying gravitino dark matter hypothesis.

Abstract

The gravitino is a promising supersymmetric dark matter candidate, even without strict R-parity conservation. In fact, with some small R-parity violation, gravitinos are sufficiently long-lived to constitute the dark matter of the universe, while the resulting cosmological scenario is consistent with primordial nucleosynthesis and the high reheating temperature needed for thermal leptogenesis. Furthermore, in this scenario the gravitino is unstable and might thus be accessible by indirect detection via its decay products. We compute in this thesis the partial decay widths for the gravitino in models with bilinear R-parity breaking. In addition, we determine the neutrino signal from astrophysical gravitino dark matter decays. Finally, we discuss the feasibility of detecting these neutrino signals in present and future neutrino experiments, and conclude that it will be a challenging task. Albeit, if detected, this distinctive signal might bring considerable support to the scenario of decaying gravitino dark matter.