WIMPs in Dilatonic Einstein Gauss-Bonnet Cosmology

We study the thermal decoupling of weakly interacting massive particles (WIMPs) in a dilatonic Einstein Gauss-Bonnet (dEGB) cosmological scenario where standard gravity is modified by a Gauss-Bonnet term non-minimally coupled to a scalar field with vanishing potential. We put constraints on the parameters of the model that drive the WIMP annihilation cross section beyond the present bounds from DM indirect detection searches. The bounds from WIMP indirect detection are nicely complementary to late-time constraints from compact binary mergers. This suggests that it could be interesting to use other Early Cosmology processes to probe the dEGB scenario.