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Understanding the suppression of structure formation from dark matter-dark energy momentum coupling

Chamings, Finlay Noble; Avgoustidis, Anastasios; Copeland, Edmund J; Green, Anne M.; Pourtsidou, Alkistis

Authors

Finlay Noble Chamings

Anastasios Avgoustidis

Edmund J Copeland

Anne M. Green

Alkistis Pourtsidou



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.

Journal Article Type Article
Publication Date Feb 24, 2020
Journal Physical Review D
Print ISSN 2470-0010
Electronic ISSN 2470-0029
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 101
Issue 4
APA6 Citation Chamings, F. N., Avgoustidis, A., Copeland, E. J., Green, A. M., & Pourtsidou, A. (2020). Understanding the suppression of structure formation from dark matter-dark energy momentum coupling. Physical Review D, 101(4), https://doi.org/10.1103/physrevd.101.043531
DOI https://doi.org/10.1103/physrevd.101.043531
Keywords Physics and Astronomy (miscellaneous)
Publisher URL https://journals.aps.org/prd/abstract/10.1103/PhysRevD.101.043531

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