期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 5, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2012/05/013
关键词
dark matter theory; particle physics - cosmology connection
资金
- NSF CAREER award [PHY1049896]
- NASA Astrophysics Theory grant [NNX11AI17G]
- DOE Grant [DE-FG02-95ER40899]
We study the dynamics of dark matter (DM) particle-antiparticle oscillations within the context of asymmetric DM. Oscillations arise due to small DM number-violating Majorana-type mass terms, and can lead to recoupling of annihilation after freeze-out and washout of the DM density. Asymmetric DM oscillations interpolate between symmetric and asymmetric DM freeze-out scenarios, and allow for a larger DM model-building parameter space. We derive the density matrix equations for DM oscillations and freeze-out from first principles using nonequilibrium field theory, and our results are qualitatively different than in previous studies. DM dynamics exhibits particle-vs-antiparticle flavor effects, depending on the interaction type, analogous to neutrino oscillations in a medium. Flavor-sensitive DM interactions include scattering or annihilation through a new vector boson, while flavor-blind interactions include scattering or s-channel annihilation through a new scalar boson. In particular, we find that flavor-sensitive annihilation does not recouple when coherent oscillations begin, and that flavor-blind scattering does not lead to decoherence.
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