论文标题
横截面计算中的自我互动暗物质理论
Cross Section Calculations in Theories of Self-Interacting Dark Matter
论文作者
论文摘要
我们研究了一个不对称的暗物质模型，其自发性暗物质由dirac fermion $χ$耦合到标量或矢量介体组成，从而通过扰动理论很好地描述了反应$χ+χ\χ+χ$。我们计算了此反应的散射横截面$σ$，转移横截面$σ_t$和粘度交叉部分$σ_V$。作为我们研究的一部分，我们对结果进行了分析和数值比较，包括$ t $ channel和$ u $ channel的交流以及在文献中经常使用的近似值中获得的结果，仅包括$ t $ - 通道贡献。这些横截面的速度依赖性进行了详细研究，并显示与观察数据一致。
We study an asymmetric dark matter model with self-interacting dark matter consisting of a Dirac fermion $χ$ coupled to a scalar or vector mediator, such that the reaction $χ+ χ\to χ+ χ$ is well described by perturbation theory. We compute the scattering cross section $σ$, the transfer cross section $σ_T$, and the viscosity cross section $σ_V$ for this reaction. As one part of our study, we give analytic and numerical comparisons of results obtained with the inclusion of both $t$-channel and $u$-channel exchanges and results obtained in an approximation that has often been used in the literature that includes only the $t$-channel contribution. The velocity dependences of these cross sections are studied in detail and shown to be in accord with observational data.
