Dark matter annihilation into leptons through gravity portals

Dark matter (DM) constitutes 85% of the in Universe. However, its specific particle property is still unclear. The fundamentals DM particles subject to gravitational interaction, and that lepton excess cosmic rays may originate from particles, inspired us investigate properties beyond standard model. We assume a leptophilic SU(2) doublet exists nature as mediator connecting with visible leptons. Since general relativity not renormalizable at quantum level, it should be regarded an effective field theory's leading order term. One species next-to-leading-order term operators linear Ricci scalar containing fields, such Higgs field, DM, or newly introduced doublet. These can cause annihilation through gravity portals. analyzed constraints antiproton flux, relic abundance, positron microwave background, direct detection experiments. result shows there vast parameter space compatible current mass electroweak scale only allowed annihilate into further show purely better explains DArk Matter Particle Explorer excess. Our work provides promising mechanism for connect model particles.