Selfish Dark Matter

Abstract

We present a mechanism where a particle asymmetry in one sector is used to generate an asymmetry in another sector. The two sectors are not coupled through particle number violating interactions and are not required to be in thermal contact with each other. When this mechanism is applied to baryogenesis in asymmetric dark matter models, we find that the dark matter particles can be extremely light, e.g. much lighter than an eV, and that in some cases there is no need to annihilate away the symmetric component of dark matter. We discuss a concrete realization of the mechanism with signals in direct detection, at the LHC, at $B$-factories or future beam dump experiments.

18+5 pages, 2 figures; Journal version: Added references, small changes to the free-streaming length estimates

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• Oscillating Asymmetric Sneutrino Dark Matter from the Maximally $U(1{)}_L$ Supersymmetric Inverse Seesaw
• Asymmetric dark matter and effective number of neutrinos
• Particle Asymmetries from Quantum Statistics
• Extragalactic Searches for Dark Matter Annihilation
• Dark Matter Energy Deposition and Production from the Table-Top to the Cosmos