Constraints on Dark Matter-Baryon Scattering from the Temperature Evolution of the Intergalactic Medium

Abstract

The thermal evolution of the intergalactic medium (IGM) can serve as a sensitive probe of cosmological heat sources and sinks. We employ it to limit interactions between dark matter and baryons. After reionization the IGM temperature is set by the balance between photoheating and adiabatic cooling. We use measurements of the IGM temperature from Lyman-$\alpha$-forest data to constrain the cross-section $\sigma$ between dark matter and baryons, finding $\sigma <10^{-20}$ cm${}^2$ for dark-matter masses $m_{\chi }\le 1$ GeV. This provides the first direct constraint on scattering between dark matter and baryons at redshift $z\sim 5$.

8 pages, 3 figures. Updated to match accepted version

References in corpus (10)

• Constraints on Dark Matter from Colliders
• Dark Matter Results from First 98.7-day Data of PandaX-II Experiment
• Cosmic microwave background limits on accreting primordial black holes
• LEP Shines Light on Dark Matter
• Limits on spin-dependent WIMP-nucleon cross section obtained from the complete LUX exposure
• Constraints on Dark Matter annihilations from reionization and heating of the intergalactic gas
• The Effects of Dark Matter-Baryon Scattering on Redshifted 21 cm Signals
• The thermal history of the intergalactic medium down to redshift z=1.5: a new curvature measurement
• On Modeling and Measuring the Temperature of the z~5 IGM
• MeV Dark Matter: Model Independent Bounds

Cited by in corpus (1)

• Limit on the dark matter mass from its interaction with photons