Computing model independent perturbations in dark energy and modified gravity

Battye, Richard A.; Pearson, Jonathan A.

doi:10.1088/1475-7516/2014/03/051

Computing model independent perturbations in dark energy and modified gravity

Battye, Richard A.; Pearson, Jonathan A.

Authors

Richard A. Battye

Jonathan A. Pearson

Abstract

We present a methodology for computing model independent perturbations in dark energy and modified gravity. This is done from the Lagrangian for perturbations, by showing how field content, symmetries, and physical principles are often sufficient ingredients for closing the set of perturbed fluid equations. The fluid equations close once ``equations of state for perturbations'' are identified: these are linear combinations of fluid and metric perturbations which construct gauge invariant entropy and anisotropic stress perturbations for broad classes of theories. Our main results are the proof of the equation of state for perturbations presented in a previous paper, and the development of the required calculational tools.

Citation

Battye, R. A., & Pearson, J. A. (2014). Computing model independent perturbations in dark energy and modified gravity. Journal of Cosmology and Astroparticle Physics, 2014(03), Article 051. https://doi.org/10.1088/1475-7516/2014/03/051

Journal Article Type	Article
Publication Date	2014-03
Deposit Date	Feb 26, 2014
Publicly Available Date	Jul 8, 2014
Journal	Journal of Cosmology and Astroparticle Physics
Publisher	IOP Publishing
Peer Reviewed	Peer Reviewed
Volume	2014
Issue	03
Article Number	051
DOI	https://doi.org/10.1088/1475-7516/2014/03/051
Keywords	Modified gravity, Cosmological perturbation theory, dark energy theory, Cosmological parameters from CMBR.

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