Consequences of DM/antiDM Oscillations for Asymmetric WIMP Dark Matter

Preprint number: CP3-Origins-2011-31 and DIAS-2011-23
Authors: Zaharijas Gabrijela (CEA/Saclay & The Oskar Klein Centre for Cosmoparticle Physics), Servant Géraldine (CERN Theory Division & CEA/Saclay), Cirelli Marco (CERN Theory Division & CEA/Saclay), and Paolo Panci (CP3-Origins & Danish Institute for Advanced Study, DIAS & CERN Theory Division & Dipartimento di Fisica, Università degli Studi dell’Aquila & INFN, Laboratori Nazionali del Gran Sasso & Université Paris 7-Diderot, UFR de Physique)
External link: arXiv.org

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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. 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.