Multi-Component Dark Matter

Abstract

We explore multi-component dark matter models where the dark sector consists of multiple stable states with different mass scales, and dark forces coupling these states further enrich the dynamics. The multi-component nature of the dark matter naturally arises in supersymmetric models, where both R parity and an additional symmetry, such as a $Z_2$, is preserved. We focus on a particular model where the heavier component of dark matter carries lepton number and annihilates mostly to leptons. The heavier component, which is essentially a sterile neutrino, naturally explains the PAMELA, ATIC and synchrotron signals, without an excess in antiprotons which typically mars other models of weak scale dark matter. The lighter component, which may have a mass from a GeV to a TeV, may explain the DAMA signal, and may be visible in low threshold runs of CDMS and XENON, which search for light dark matter.

4 pages, no figures. v2: paper shortened to letter length; modified dark matter spectrum

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Cited by in corpus (9)

• Non-Abelian Dark Sectors and Their Collider Signatures
• Kinetic Mixing as the Origin of Light Dark Scales
• A Pure-Glue Hidden Valley I. States and Decays
• Bounds on Cross-sections and Lifetimes for Dark Matter Annihilation and Decay into Charged Leptons from Gamma-ray Observations of Dwarf Galaxies
• Dark matter and sub-GeV hidden U(1) in GMSB models
• How Dark Matter Reionized The Universe
• TASI 2008 Lectures on Dark Matter
• Extended MSSM Neutralinos as the Source of the PAMELA Positron Excess
• PAMELA/ATIC anomaly from the meta-stable extra dark matter component and the leptophilic Yukawa interaction