Speaker
Description
We study a minimal model for light scalar dark matter (DM) which requires a light scalar mediator to address the core-cusp problem as well as to interact with the standard model. We focus on the Breit-Wigner resonance for the DM annihilation and self-scattering channels. The thermally-averaged annihilation cross-section of DM has strong temperature dependence, whereas its energy exchange by elastic scattering with the thermal bath particles is suppressed. This leads to the early kinetic decoupling of DM and modifies the standard calculation of the relic density. A systematic analysis of the model is done involving the latest and future constraints such as the CMB observations, indirect dark matter detection and the collider searches of the invisibly decaying mediator. In particular, we address the indirect search prospects for dark matter of mass range from sub-GeV to a few GeV with cosmic ray and gamma/X-ray observations.
