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We present a framework where dark matter interacts with the Standard Modelthrough a light, spin-0 mediator that couples chirally to pairs ofdifferent-flavor leptons. This flavor violating final state weakens bounds onnew physics coupled to leptons from terrestrial experiments and cosmic-raymeasurements. As an example, we apply this framework to construct a model forthe Fermi-LAT excess of GeV $\gamma$-rays from the galactic center. We commenton the viability of this portal for self-interacting dark matter explanationsof small scale structure anomalies and embeddings in flavor models. Models ofthis type are shown to be compatible with the muon anomalous magnetic momentanomaly. We review current experimental constraints and identify possiblefuture theoretical and experimental directions.

Lepton-Flavor Violating Mediators