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We derive new limits on the elastic scattering cross-section between baryonsand dark matter using Cosmic Microwave Background data from the Plancksatellite and measurements of the Lyman-alpha forest flux power spectrum fromthe Sloan Digital Sky Survey. Our analysis addresses generic cross sections ofthe form $\sigma\propto v^n$, where v is the dark matter-baryon relativevelocity, allowing for constraints on the cross section independent of specificparticle physics models. We include high-$\ell$ polarization data from Planckin our analysis, improving over previous constraints. We apply a more carefultreatment of dark matter thermal evolution than previously done, allowing us toextend our constraints down to dark matter masses of $\sim$MeV. We show in thiswork that cosmological probes are complementary to current direct detection andastrophysical searches.

Probing sub-GeV Dark Matter-Baryon Scattering with Cosmological Observables