Mirage in the Sky: Non-thermal Dark Matter, Gravitino Problem, and Cosmic Ray Anomalies

Abstract

Recent anomalies in cosmic rays could be due to dark matter annihilation in our galaxy. In order to get the required large cross-section to explain the data while still obtaining the right relic density, we rely on a non standard thermal history between dark matter freeze-out and Big-Bang Nucleosynthesis (BBN). We show that through a reheating phase from the decay of a heavy moduli or even the gravitino, we can produce the right relic density of dark matter if its self-annihilation cross-section is large enough. In addition to fitting the recent data, this scenario solves the cosmological moduli and gravitino problems. We illustrate this mechanism with a specific example in the context of U(1)_{B-L} extended MSSM where supersymmetry is broken via mirage mediation. These string motivated models naturally contain heavy moduli decaying to the gravitino, whose subsequent decay to the LSP can reheat the universe at a low temperature. The right-handed sneutrino and the B-L gaugino can both be viable dark matter candidates with large cross-section. They are leptophilic because of B-L charges. We also show that it is possible to distinguish the non-thermal from the thermal scenario (using Sommerfeld enhancement) in direct detection experiments for certain regions of parameter space.

11 pages, 4 figures

References in corpus (18)

• Observation of an anomalous positron abundance in the cosmic radiation
• A Theory of Dark Matter
• Measurement of the Cosmic Ray e+ plus e- spectrum from 20 GeV to 1 TeV with the Fermi Large Area Telescope
• A new measurement of the antiproton-to-proton flux ratio up to 100 GeV in the cosmic radiation
• Constraints on WIMP Dark Matter from the High Energy PAMELA $\bar{p}/p$ data
• Moduli-Induced Gravitino Problem
• Non-thermal Dark Matter and the Moduli Problem in String Frameworks
• Moduli Decays and Gravitinos
• Unifying inflation and dark matter with neutrino masses
• Neutralino Dark Matter in Mirage Mediation
• Substructure Boosts to Dark Matter Annihilation from Sommerfeld Enhancement
• Is the dark matter interpretation of the EGRET gamma excess compatible with antiproton measurements?
• Sneutrino Dark Matter and the Observed Anomalies in Cosmic Rays
• Dark Matter and LHC: What is the Connection?
• Nonthermal dark matter in mirage mediation
• Direct/indirect detection signatures of nonthermally produced dark matter
• Neutrino Masses, Baryon Asymmetry, Dark Matter and the Moduli Problem : A Complete Framework
• B-L assisted Anomaly Mediation and the radiative B-L symmetry breaking

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• Simplified Dark Matter Models with Charged Mediators: Prospects for Direct Detection
• Affleck-Dine Baryogenesis in Effective Supergravity
• Early Matter Domination from Long-Lived Particles in the Visible Sector
• Dark Matter at the Pseudoscalar Higgs Resonance in the pMSSM and SUSY GUTs
• Constraints on a Non-thermal History from Galactic Dark Matter Spikes
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