2017/12/31 by Vera Gluscevic, Kimberly K. Boddy · 2 citations
Physics and Astronomy · #astro-ph.CO #hep-ph
paper · pdf · doi:10.1103/physrevlett.121.081301
published as Phys. Rev. Lett. 121, 081301 (2018) · published version (spin-factor correction and corresponding text changes are included)
arxiv created 2018/09/02 · arxiv updated 2018/09/05
We present the first cosmological constraint on dark matter scattering with protons in the early Universe for the entire range of dark matter masses between 1 keV and 1 TeV. This constraint is derived from the Planck measurements of the cosmic microwave background (CMB) temperature and polarization anisotropy, and the CMB lensing anisotropy. It improves upon previous CMB constraints by many orders of magnitude, where limits are available, and closes the gap in coverage for low-mass dark matter candidates. We focus on two canonical interaction scenarios: spin-independent and spin-dependent scattering with no velocity dependence. Our results exclude (with 95% confidence) spin-independent interactions with cross sections greater than 5.3 × 10-27 cm2 for 1 keV, 3.0 × 10-26 cm2 for 1 MeV, 1.7 × 10-25 cm2 for 1 GeV, and 1.6 × 10-23 cm2 for 1 TeV dark matter mass. Finally, we discuss the implications of this study for dark matter physics and future observations.