How to optimally parametrize deviations from general relativity in the evolution of cosmological perturbations
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Pogosian-2010-How to optimally par.pdf
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Author(s)
Pogosian, Levon
Silvestri, Alessandra
Koyama, Kazuya
Zhao, Gong-Bo
Date Issued
May 2010
Journal
Physical Review D
Publisher
American Physical Society
Citation
Pogosian, Levon et al. “How to optimally parametrize deviations from general relativity in the evolution of cosmological perturbations.” Physical Review D 81.10 (2010): 104023. © 2010 The American Physical Society.
Version
Final published version
Abstract
The next generation of weak lensing surveys will trace the growth of large scale perturbations through a sequence of epochs, offering an opportunity to test general relativity on cosmological scales. We review in detail the parametrization used in MGCAMB to describe the modified growth expected in alternative theories of gravity and generalized dark energy models. We highlight its advantages and examine several theoretical aspects. In particular, we show that the same set of equations can be consistently used on superhorizon and subhorizon linear scales. We also emphasize the sensitivity of data to scale-dependent features in the growth pattern, and propose using principal component analysis to converge on a practical set of parameters which is most likely to detect departures from general relativity. The connection with other parametrizations is also discussed.
MIT Department
Massachusetts Institute of Technology. Department of Physics
MIT Kavli Institute for Astrophysics and Space Research
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.81.104023
