Modification of the Sommerfeld effect due to coannihilator decays  

作　　者：Feng Luo 罗峰(School of Physics and Astronomy,Sun Yat-sen University,Zhuhai 519082,China)

机构地区：[1]School of Physics and Astronomy,Sun Yat-sen University,Zhuhai 519082,China

出　　处：《Chinese Physics C》2025年第3期1-16,共16页中国物理C(英文版)

基　　金：Supported by the Sun Yat-sen University Science Foundation。

摘　　要：In dark matter coannihilation scenarios,the Sommerfeld effect of coannihilators is usually important in the calculations of dark matter thermal relic abundance.Due to decays of coannihilators,two annihilating coannihilators can only approach each other from a finite initial separation.While conventional derivations of Sommerfeld factors essentially assume an infinite initial separation,Sommerfeld factors for a pair of annihilating coannihilators may be different.We find that the Sommerfeld factor for a pair of coannihilators is less prominent than that obtained without considering decays.Modification of the Sommerfeld factor may result in a change of the dark matter thermal relic abundance well beyond the percent level.

关 键 词：dark matter sommerfeld effect relic abundance coannihilation 

分 类 号：O57[理学—粒子物理与原子核物理]