Consequences of DM/antiDM Oscillations for Asymmetric WIMP Dark Matter

Abstract

Assuming the existence of a primordial asymmetry in the dark sector, a scenario usually dubbed Asymmetric Dark Matter (aDM), we study the effect of oscillations between dark matter and its antiparticle on the re-equilibration of the initial asymmetry before freeze-out, which enable efficient annihilations to recouple. We calculate the evolution of the DM relic abundance and show how oscillations re-open the parameter space of aDM models, in particular in the direction of allowing large (WIMP-scale) DM masses. A typical wimp with a mass at the EW scale (\sim 100 GeV - 1 TeV) presenting a primordial asymmetry of the same order as the baryon asymmetry naturally gets the correct relic abundance if the DM-number-violating Delta(DM) = 2 mass term is in the \sim meV range. The re-establishment of annihilations implies that constraints from the accumulation of aDM in astrophysical bodies are evaded. On the other hand, the ordinary bounds from BBN, CMB and indirect detection signals on annihilating DM have to be considered.

27 pages, 6+1 figures; v2: version submitted to JCAP for publication, one new figure and one new table added, summary plots slightly revised, a few clarifications added, main point emphasized, results unchanged

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• Annihilation Signals from Asymmetric Dark Matter
• Asymmetric Higgsino Dark Matter
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• Baryogenesis from neutron-dark matter oscillations
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• Dark Matter Candidates and Searches
• Dark Matter Antibaryons from a Supersymmetric Hidden Sector
• Baryogenesis via Particle-Antiparticle Oscillations
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• Oscillating Composite Asymmetric Dark Matter
• Baryonic and Leptonic GeV Dark Matter
• Right-handed sneutrinos as asymmetric DM and neutrino masses from neutrinophilic Higgs bosons
• Late-Time Dark Matter Oscillations and the Core-Cusp Problem
• Constraints on asymmetric dark matter from asteroseismology
• Quark Seesaw, Dark $U(1)$ symmetry and Baryon-Dark Matter Coincidence
• Time variation of particle and anti-particle asymmetry in an expanding universe
• Constraints on Majorana Dark Matter from a Fourth Lepton Family
• Asymgenesis