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arXiv · 1802.06788

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

Weishuang Linda Xu·Cora Dvorkin·Andrew Chael
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Abstract

We derive new limits on the elastic scattering cross-section between baryons and dark matter using Cosmic Microwave Background data from the Planck satellite and measurements of the Lyman-alpha forest flux power spectrum from the Sloan Digital Sky Survey. Our analysis addresses generic cross sections of the form $\sigma\propto v^n$, where v is the dark matter-baryon relative velocity, allowing for constraints on the cross section independent of specific particle physics models. We include high-$\ell$ polarization data from Planck in our analysis, improving over previous constraints. We apply a more careful treatment of dark matter thermal evolution than previously done, allowing us to extend our constraints down to dark matter masses of $\sim$MeV. We show in this work that cosmological probes are complementary to current direct detection and astrophysical searches.

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Weishuang Linda Xu, Cora Dvorkin, Andrew Chael. 2018-02-19. Probing sub-GeV Dark Matter-Baryon Scattering with Cosmological Observables. https://doi.org/10.1103/physrevd.97.103530

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