How to optimally parametrize deviations from general relativity in the evolution of cosmological perturbations

2010/02/28 by Levon Pogosian, Alessandra Silvestri, K. Koyama +3 · 7 citations
Physics and Astronomy · #Advanced Differential Geometry Research #Astrophysics #Classical mechanics #Cosmological model #Cosmology #Cosmology and Gravitation Theories #General relativity #Physics #Relativity and Gravitational Theory #Theoretical physics #Theory of relativity #astro-ph.CO

paper · pdf · doi:10.1103/physrevd.81.104023

published as Phys.Rev.D81:104023,2010 · 10 pages, 5 figures, one equation edited, results unchanged

openalex publication_date 2010/05/11 · arxiv created 2011/06/13 · arxiv updated 2011/06/14 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

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.

Citations

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• Massive neutrinos and cosmology
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• Phenomenology of dark energy: general features of large-scale perturbations
• Cosmological tests of general relativity: A principal component analysis
• The Fisher gAlaxy suRvey cOde (FARO)