Predictions for the Sky-Averaged Depth of the 21 cm Absorption Signal at High Redshift in Cosmologies with and without Nonbaryonic Cold Dark Matter

Authors

Stacy S. McGaugh, Case Western Reserve UniversityFollow

Document Type

Article

Publication Date

8-22-2018

Abstract

We consider the 21 cm absorption signal expected at high redshift in cosmologies with and without nonbaryonic cold dark matter. The expansion of the early Universe decelerates strongly with dark matter, but approximately coasts without it. This results in a different path length across the epochs when absorption is expected, with the consequence that the absorption is predicted to be a factor of ∼2 greater without dark matter than with it. Observation of such a signal would motivate consideration of extended theories of gravity in lieu of dark matter.

Keywords

alternative gravity theories, dark matter, evolution of the universe, gravitation, large scale structure of the universe

Publication Title

Physical Review Letters

Grant

103533

Rights

© American Physical Society. Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.

Recommended Citation

McGaugh, Stacy S. Predictions for the Sky-Averaged Depth of the 21 cm Absorption Signal at High Redshift in Cosmologies with and without Nonbaryonic Cold Dark Matter. Phys. Rev. Lett., volume 121, issue8, 2018, doi: 10.1103/PhysRevLett.121.081305