Skip to main content

Research Repository

Advanced Search

How to avoid a swift kick in the chameleons

Padilla, Antonio; Platts, Emma; Stefanyszyn, David; Walters, Anthony; Weltman, Amanda; Wilson, Toby

Authors

Emma Platts

David Stefanyszyn

Anthony Walters

Amanda Weltman

Toby Wilson



Abstract

Recently, it was argued that the conformal coupling of the chameleon to matter fields created an issue for early universe cosmology. As standard model degrees of freedom become non-relativistic in the early universe, the chameleon is attracted towards a “surfing'' solution, so that it arrives at the potential minimum with too large a velocity. This leads to rapid variations in the chameleon's mass and excitation of high energy modes, casting doubts on the classical treatment at Big Bang Nucleosynthesis. Here we present the DBI chameleon, a consistent high energy modification of the chameleon theory that dynamically renders it weakly coupled to matter during the early universe thereby eliminating the adverse effects of the `kicks'. This is done without any fine tuning of the coupling between the chameleon and matter fields, and retains its screening ability in the solar system. We demonstrate this explicitly with a combination of analytic and numerical results.

Citation

Padilla, A., Platts, E., Stefanyszyn, D., Walters, A., Weltman, A., & Wilson, T. (2016). How to avoid a swift kick in the chameleons. Journal of Cosmology and Astroparticle Physics, 2016, https://doi.org/10.1088/1475-7516/2016/03/058

Journal Article Type Article
Acceptance Date Mar 4, 2016
Publication Date Mar 30, 2016
Deposit Date Mar 6, 2017
Publicly Available Date Mar 6, 2017
Journal Journal of Cosmology and Astroparticle Physics
Electronic ISSN 1475-7516
Publisher IOP Publishing
Peer Reviewed Peer Reviewed
Volume 2016
Article Number 58
DOI https://doi.org/10.1088/1475-7516/2016/03/058
Keywords Modified gravity, Big bang nucleosynthesis, Particle physics, Cosmology connection
Public URL http://eprints.nottingham.ac.uk/id/eprint/41011
Publisher URL http://iopscience.iop.org/article/10.1088/1475-7516/2016/03/058/meta
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0

Files


Padilla chameleons.pdf (1.2 Mb)
PDF

Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0





You might also like



Downloadable Citations