Maximally self-interacting dark matter: models and predictions

• Main Authors: Ayuki Kamada, Hee Jung Kim, Takumi Kuwahara
• Format: Article
• Language: English
• Published: SpringerOpen 2020-12-01
• Series: Journal of High Energy Physics
• Subjects: Beyond Standard Model; Cosmology of Theories beyond the SM
• Online Access: https://doi.org/10.1007/JHEP12(2020)202

Abstract We study self-interacting dark matter (SIDM) scenarios, where the s-wave self-scattering cross section almost saturates the Unitarity bound. Such self-scattering cross sections are singly parameterized by the dark matter mass, and are featured by strong velocity dependence in a wide range of velocities. They may be indicated by observations of dark matter halos in a wide range of masses, from Milky Way’s dwarf spheroidal galaxies to galaxy clusters. We pin down the model parameters that saturates the Unitarity bound in well-motivated SIDM models: the gauged L μ − L τ model and composite asymmetric dark matter model. We discuss implications and predictions of such model parameters for cosmology like the H 0 tension and dark-matter direct-detection experiments, and particle phenomenology like the beam-dump experiments.