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arXiv 1303.0948hep-ph
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长寿命粒子衰变产生Wino暗物质的非热过程

Non-Thermal Production of Wino Dark Matter via the Decay of Long-Lived Particles

Takeo Moroi, Minoru Nagai, Masahiro Takimoto

摘要:

我们考虑超对称模型中,中性威诺是最轻的超粒子(LSP),并研究的可能性,非热产生的威诺发挥的作用,暗物质。如果威诺质量小于2.9 TeV,那么威诺的热遗迹密度将小于暗物质目前的质量密度;然而,即使威诺质量较小,如果威诺是由外来粒子衰变产生的非热产物,那么它也可能是暗物质的主要成分。为了详细研究这种可能性,我们进行了一个精确的计算Wino的质量密度产生的外来粒子衰变,考虑到以下影响:(i)带电和中性Winos之间的共湮灭,(ii)Sommerfeld效应对Winos的对湮灭截面。我们考虑几个动机良好的情况下,异国情调的粒子对应于宇宙学模场,引力子,或axino,并讨论这些情况下的威诺LSP的含义。

英文摘要:

We consider supersymmetric models in which the neutral Wino is the lightest superparticle (LSP), and study the possibility that non-thermally produced Wino plays the role of dark matter. The thermal relic density of Wino is smaller than the present mass density of dark matter if wino mass is smaller than 2.9 TeV; however, even with smaller Wino mass, Wino can be the dominant component of dark matter if it is non-thermally produced by the decay of an exotic particle. In order to study such a possibility in detail, we perform a precise calculation of the present mass density of Wino produced by the exotic-particle decay, taking account of the following effects: (i) coannihilation among charged and neutral Winos, and (ii) Sommerfeld effect on the pair annihilation cross section of Winos. We consider several well-motivated cases where the exotic particle corresponds to cosmological moduli fields, gravitino, or axino, and discuss the implication of the Wino LSP for these cases.

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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