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2011

Regenerating a Symmetry in Asymmetric Dark Matter

Buckley, Matthew R., Profumo, Stefano

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Asymmetric dark matter theories generically allow for mass terms that lead to particle-antiparticle mixing.

Over the age of the Universe, dark matter can thus oscillate from a purely asymmetric configuration into a symmetric mix of particles and antiparticles, allowing for pair-annihilation processes.
Additionally, requiring efficient depletion of the primordial thermal (symmetric) component generically entails large annihilation rates.
We show that unless some symmetry completely forbids dark matter particle-antiparticle mixing, asymmetric dark matter is effectively ruled out for a large range of masses, for almost any oscillation time-scale shorter than the age of the Universe.

Regenerating a Symmetry in Asymmetric Dark Matter · Around

Built on

P. Minkowski, Phys. Lett. B67
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P. Gondolo, G. Gelmini, Nucl. Phys. B360
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