Testing Modified Dark Matter with galaxy clusters: Does dark matter know about the cosmological constant?

2016/01/04 by Douglas Edmonds, Doug Edmonds, Duncan Farrah +4
Physics and Astronomy · #Cold dark matter #Cosmological constant #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark fluid #Dark matter #Galaxies: Formation, Evolution, Phenomena #Galaxy #Galaxy rotation curve #Hot dark matter #Lambda-CDM model #Scalar field dark matter #astro-ph.CO #astro-ph.HE #hep-ph

paper · pdf · doi:10.1142/s0217751x17501081

arxiv created 2016/01/04 · openalex created_date 2016/06/24 · openalex publication_date 2017/06/28 · arxiv updated 2017/07/26 · openalex updated_date 2026/08/05

Abstract

We discuss the possibility that the cold dark matter mass profiles contain information on the cosmological constant [Formula: see text], and that such information constrains the nature of cold dark matter (CDM). We call this approach Modified Dark Matter (MDM). In particular, we examine the ability of MDM to explain the observed mass profiles of 13 galaxy clusters. Using general arguments from gravitational thermodynamics, we provide a theoretical justification for our MDM mass profile. In order to properly fit the shape of the mass profiles in galaxy clusters, we find it necessary to generalize the MDM mass profile from the one we used previously to fit galactic rotation curves. We successfully compare it to the NFW mass profiles both on cluster and galactic scales, though differences in form appear with the change in scales. Our results suggest that indeed the CDM mass profiles contain information about the cosmological constant in a nontrivial way.

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