Critical assessment of CMB limits on dark matter-baryon scattering: New treatment of the relative bulk velocity

Kimberly K. Boddy, Vera Gluscevic, Vivian Poulin, Ely D. Kovetz, Marc Kamionkowski, and Rennan Barkana
Phys. Rev. D 98, 123506 – Published 10 December 2018

Abstract

We perform an improved cosmic microwave background (CMB) analysis to search for dark matter–proton scattering with a momentum-transfer cross section of the form σ0vn for n=2 and n=4. In particular, we present a new and robust prescription for incorporating the relative bulk velocity between the dark matter and baryon fluids into the standard linear Boltzmann calculation. Using an iterative procedure, we self-consistently include the effects of the bulk velocities in a cosmology in which dark matter interacts with baryons. With this prescription, we derive CMB bounds on the cross section, excluding σ0>2.3×1033cm2 for n=2 and σ0>1.7×1041cm2 for n=4 at 95% confidence, for dark matter masses below 10 MeV. Furthermore, we investigate how these constraints change when only a subcomponent of dark matter is interacting. We show that Planck limits vanish if 0.4% of dark matter is tightly coupled to baryons. We discuss the implications of our results for present and future cosmological observations.

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  • Received 10 August 2018

DOI:https://doi.org/10.1103/PhysRevD.98.123506

© 2018 American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
Gravitation, Cosmology & Astrophysics

Authors & Affiliations

Kimberly K. Boddy1, Vera Gluscevic2,3, Vivian Poulin1, Ely D. Kovetz1, Marc Kamionkowski1, and Rennan Barkana4

  • 1Department of Physics & Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA
  • 2School of Natural Sciences, Institute for Advanced Study, Einstein Drive, Princeton, New Jersey 08540, USA
  • 3Department of Physics, University of Florida, Gainesville, Florida 32611, USA
  • 4Raymond and Beverly Sackler School of Physics and Astronomy, Tel-Aviv University, Tel-Aviv 69978, Israel

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Issue

Vol. 98, Iss. 12 — 15 December 2018

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