Journal
PHYSICAL REVIEW LETTERS
Volume 108, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.108.011301
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Funding
- U.S. Department of Energy [DE-AC02-07CH11359, DE-FG02-04ER41268]
- NSF [PHY-0757911, 1066293]
- Direct For Mathematical & Physical Scien [757911] Funding Source: National Science Foundation
- Division Of Physics [757911] Funding Source: National Science Foundation
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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.
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