Thermal abundance of non-relativistic relics with Sommerfeld enhancement

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• 作者：Hoernisa Iminniyaz^a ; ^b ; ^{wrns@xju.edu.cn"" rel=""nofollow} ; Mitsuru Kakizaki^c ; ^{kakizaki@lapp.in2p3.fr"" rel=""nofollow}
• 刊名：Nuclear Physics B
• 出版年：2011
• 出版时间：1 October 2011
• 年：2011
• 卷：851
• 期：1
• 页码：57-65
• 全文大小：196 K

文摘

We propose an analytic treatment for computing the relic abundances of non-relativistic particles whose annihilation rate at chemical decoupling is increased by Sommerfeld enhancement. We find approximate rational functions that closely fit the thermal average of Sommerfeld-enhanced cross sections in the massless limit of force carriers for s- and p-wave annihilations. We demonstrate that, with the approximate thermally-averaged cross sections implemented, the standard analytic method for the final relic abundances provides accuracy to within 1 % even for the case of Sommerfeld enhancement.