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arXiv 1202.0283hep-phastro-ph.CO
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振荡非对称暗物质

Oscillating Asymmetric Dark Matter

Sean Tulin, Hai-Bo Yu, Kathryn M. Zurek

摘要:

本文研究了非对称暗物质背景下暗物质粒子-反粒子振荡的动力学。振荡的出现是由于小DM数违反马约拉纳型质量项,并可能导致重新耦合的湮灭后冻结和清洗的DM密度。我们利用非平衡场论从第一性原理导出了DM振荡和冻结的密度矩阵方程,我们的结果与以前的研究有质的不同。DM动力学表现出粒子对反粒子的“味道”效应,这取决于相互作用的类型,类似于介质中的中微子振荡。“味敏”DM相互作用包括通过新的矢量玻色子的散射或湮灭,而“味盲”相互作用包括通过新的标量玻色子的散射或s通道湮灭,或湮灭到玻色子对。特别是,我们发现,味道敏感的湮灭不重新耦合时,相干振荡开始,味盲散射不会导致退相干。

英文摘要:

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. 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, or annihilation to pairs of bosons. 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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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