Dark matter indirect signals with long-lived mediators

Dark matter indirect signals with long - lived mediators

Dark matter particles could annihilate into light and metastable mediators subsequently decaying far away from where they are produced. In this scenario, the indirect signatures of dark matter are altered with respect to the conventional situation where standard model particles are directly injected where annihilation happens. We revisit the long-lived particle proposal (Rothstein et al., 2009)...

Indirect Dark Matter Signals

Dark Matter annihilation (DMA) may yield an excess of gamma rays and antimatter particles, like antiprotons and positrons, above the background from cosmic ray interactions. Several signatures, ranging from the positron excess, as observed by HEAT, AMS-01 and PAMELA, the gamma ray excess, as observed by the EGRET spectrometer, the WMAP-haze, and constraints from antiprotons, as observed by BESS...

CMB and 21-cm signals for dark matter with a long-lived excited state

Long Lived Superheavy Dark Matter with Discrete Gauge Symmetries

The recently observed ultra-high energy (UHE) cosmic rays beyond the Greisen-Zatsepin-Kuzmin bound can be explained by the decays of some superheavy X particles forming a part of dark matter in our universe. We consider various discrete gauge symmetries ZN to ensure the required long lifetime (τX ≃ 10 10−1022 years) of the X particle to explain the UHE cosmic rays in the minimal supersymmetric ...

Indirect Signals from Dark Matter in Split Supersymmetry

We study the possibilities for the indirect detection of dark matter in Split Supersymmetry from γ-rays, positrons, and antiprotons. The most promising signal is the γ-ray line, which may be observable at the next generation of detectors. For certain halo profiles and a high mass neutralino, the line can even be visible in current experiments. The continuous γ-ray signal may be observable, if t...