Fitting a Self-Interacting Dark Matter Model to Data Ranging From Satellite Galaxies to Galaxy Clusters

TL;DR

This paper fits an asymmetric self-interacting dark matter model to observational data across a wide range of astrophysical scales, demonstrating good agreement with data from dwarf galaxies to galaxy clusters using comprehensive scattering cross sections.

Contribution

It introduces a new calculation of dark matter scattering cross sections including both $t$-channel and $u$-channel exchanges, improving previous models that only considered $t$-channel contributions.

Findings

Good fits to data from dwarf galaxies to galaxy clusters.

Effective modeling across velocities from 20 km/sec to over 1000 km/sec.

Enhanced scattering cross section calculations incorporating both exchange channels.

Abstract

We present a fit to observational data in an asymmetric self-interacting dark matter model using our recently calculated cross sections that incorporate both $t$-channel and $u$-channel exchanges in the scattering of identical particles. We find good fits to the data ranging from dwarf galaxies to galaxy clusters, and equivalent relative velocities from $\sim 20$ km/sec to $\gtrsim 10^3$ km/s. We compare our results with previous fits that used only $t$-channel exchange contributions to the scattering.