Cross Section Calculations in Theories of SelfInteracting Dark Matter
Abstract
We study an asymmetric dark matter model with selfinteracting dark matter consisting of a Dirac fermion $\chi$ coupled to a scalar or vector mediator, such that the reaction $\chi + \chi \to \chi + \chi$ is well described by perturbation theory. We compute the scattering cross section $\sigma$, the transfer cross section $\sigma_T$, and the viscosity cross section $\sigma_V$ 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.
 Publication:

arXiv eprints
 Pub Date:
 June 2022
 arXiv:
 arXiv:2206.14395
 Bibcode:
 2022arXiv220614395G
 Keywords:

 High Energy Physics  Phenomenology;
 Astrophysics  Cosmology and Nongalactic Astrophysics;
 Astrophysics  Astrophysics of Galaxies;
 High Energy Physics  Experiment;
 High Energy Physics  Theory
 EPrint:
 15 pages, 10 figures