Disentangling dark physics with cosmic microwave background experiments

• DOI: 10.1103/physrevd.98.123524
• Publication Date: 2018-12-20T08:52:20Z
• Authors: Zack Li; Vera Gluscevic; Kimberly K. Boddy; Mathew S. Madhava...
• Keywords: Cosmology and Nongalactic Astrophysics (astro-ph.CO); 0103 physical sciences; FOS: Physical sciences; 01 natural sciences; Astrophysics - Cosmology and Nongalactic Astrophysics

We forecast constraints on dark matter (DM) scattering with baryons in the early Universe upcoming and future cosmic microwave background (CMB) experiments, for DM particle masses down to 15 keV. In terms of upper limit interaction cross section a velocity-independent spin-independent elastic scattering, compared current Planck results, we find factor $\ensuremath{\sim}6$ improvement CMB-Stage 3, $\ensuremath{\sim}26$ 4, $\ensuremath{\sim}200$ cosmic-variance limited experiment. Once instrumental noise reaches proximity $1\text{ }\text{ }\ensuremath{\mu}\mathrm{K}$-arcmin, are entirely driven by lensing measurements. The benefit from wide survey, show gradual levels $10\text{ }\ensuremath{\mu}\mathrm{K}$-arcmin resolution 5 arcmin 1 arcmin. further study degeneracies between interactions various other signatures new physics targeted CMB experiments. primary temperature polarization only, moderate degeneracy effects signals massive neutrinos, effective number relativistic degrees freedom. is almost broken once convergence spectrum included into analyses. discuss implications our findings context planned measurements cosmological probes dark-sector neutrino physics.