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Effects of Kinetic Decoupling on Relic Density with Sommerfeld Enhancement |
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| Authors: | Hoernisa Iminniyaz CHEN Xue-Lei BI Xiao-Jun Sayipjamal Dulat |
| Institution: | 1.School of Physics Science and Technology, Xinjiang University, Urumqi 830046, China;2.Center for High Energy Physics, Peking University, Beijing 100871, China;3.National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China;4.Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China |
| Abstract: | We investigate the effect of kinetic decoupling on the relic density of the non-relativistic particles whose annihilation rate is increased by Sommerfeld enhancement. We discuss the effect of kinetic decoupling both for the Sommerfeld enhanced s-wave annihilation and p-wave anihilation cross sections. We find after kientic decoupling Sommerfeld enhanced annihilations continue to change the particle abundance until the matter domination begins or the Sommerfeld effect cuts off. We provide analytic estimates of this effect. |
| Keywords: | dark matter kinetic decoupling relic density |
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