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We study the thermal transport occurring in the system of solar captured darkmatter (DM) and explore its impact on the DM indirect search signal. Weparticularly focus on the scenario of self-interacting DM (SIDM). The flows ofenergies in and out of the system are caused by solar captures via DM-nucleonand DM-DM scatterings, the energy dissipation via DM annihilation, and the heatexchange between DM and solar nuclei. We examine the DM temperature evolutionand demonstrate that the DM temperature can be higher than the core temperatureof the Sun if the DM-nucleon cross section is sufficiently small such that theenergy flow due to DM self-interaction becomes relatively important. We arguethat the correct DM temperature should be used for accurately predicting the DMannihilation rate, which is relevant to the DM indirect detection.

Thermal transport of the solar captured dark matter and its impact on the indirect dark matter search