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Dark Matter in Earth intersecting orbits can scatter off the electrons andlose energy, and finally be gravitationally bound to Earth. Eventually theylose enough energy and accumulate at the core. It is assumed that DMannihilates/decays predominantly into Standard Model particles inside Earth.The heat flux from these processes is compared with the experimentally measuredvalue of internal heat flux of Earth which is 44 TW. Assuming steady statebetween capture and annihilation/decay, we put constraints on the scatteringcross section of DM with electrons as a function of their mass. For low massregions ($<10^{-2}$GeV), these constraints on leptophilic DM are better thanones obtained from direct-detection experiments.

Constraints on leptophilic light dark matter from internal heat flux of Earth