The scale-free gravothermal fluid formalism has long proved effective in describing the evolution of self-interacting dark matter halos with a constant dark matter particle cross section. However, whether the gravothermal fluid solutions match numerical simulations for velocity-dependent cross-section scenarios remains untested. In this work, we provide a fast mapping method that relates the constant-cross-section gravothermal solution to models with arbitrary velocity dependence in the cross section. We show that the gravothermal solutions after mapping are in good agreement with Arepo N-Body simulation results. We illustrate the power of this approach by applying this fast mapping method to a halo hosting a low surface brightness galaxy UGC 128. We show that this fast mapping method can be used to constrain free parameters in a physically motivated cross-section model and illustrate parameter space favored by the rotation curve measurement.
@article{arxiv.2205.02957,
title = {Gravothermal solutions of SIDM halos: mapping from constant to velocity-dependent cross section},
author = {Shengqi Yang and Xiaolong Du and Zhichao Carton Zeng and Andrew Benson and Fangzhou Jiang and Ethan O. Nadler and Annika H. G. Peter},
journal= {arXiv preprint arXiv:2205.02957},
year = {2023}
}