Understanding the suppression of structure formation from dark matter$\unicode{x2013}$dark energy momentum coupling
Abstract
Models in which scalar field dark energy interacts with dark matter via a pure momentum coupling have previously been found to potentially ease the structure formation tension between early- and late-universe observations. In this article we explore the physical mechanism underlying this feature. We argue analytically that the perturbation growth equations imply the suppression of structure growth, illustrating our discussion with numerical calculations. Then we generalise the previously studied quadratic coupling between the dark energy and dark matter to a more general power law case, also allowing for the slope of the dark energy exponential potential to vary. We find that the structure growth suppression is a generic feature of power law couplings and it can, for a range of parameter values, be larger than previously found.
Keywords
Cite
@article{arxiv.1912.09858,
title = {Understanding the suppression of structure formation from dark matter$\unicode{x2013}$dark energy momentum coupling},
author = {Finlay Noble Chamings and Anastasios Avgoustidis and Edmund J. Copeland and Anne M. Green and Alkistis Pourtsidou},
journal= {arXiv preprint arXiv:1912.09858},
year = {2020}
}
Comments
10 pages, 10 figures, v2: version to appear in Phys. Rev. D with minor changes to discussion