Papers › New limits on light dark matter - proton cross section from the cosmic large-scale structure
New limits on light dark matter - proton cross section from the cosmic large-scale structure
Keir K. Rogers, Cora Dvorkin, Hiranya V. Peiris
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We set the strongest limits to-date on the velocity-independent dark matter (DM) - proton cross section σ for DM masses m = 10 keV to 100 GeV, using large-scale structure traced by the Lyman-alpha forest: e.g., a 95% lower limit σ< 6 ×10⁻³⁰ cm², for m = 100 keV. Our results complement direct detection, which has limited sensitivity to sub-GeV DM. We use an emulator of cosmological simulations, combined with data from the smallest cosmological scales used to-date, to model and search for the imprint of primordial DM-proton collisions. Cosmological bounds are improved by up to a factor of 25.
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