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Parametrized modified gravity and the CMB bispectrum

Author(s)
Silvestri, Alessandra; Valentino, Eleonora Di; Salvatelli, Valentina; Melchiorri, Alessandro
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Abstract
We forecast the constraints on modified theories of gravity from the cosmic microwave background (CMB) anisotropies bispectrum that arises from correlations between lensing and the Integrated Sachs-Wolfe effect. In models of modified gravity the evolution of the metric potentials is generally altered and the contribution to the CMB bispectrum signal can differ significantly from the one expected in the standard cosmological model. We adopt a parametrized approach and focus on three different classes of models: Linder’s growth index, Chameleon-type models, and f(R) theories. We show that the constraints on the parameters of the models will significantly improve with future CMB bispectrum measurements.
Date issued
2012-09
URI
http://hdl.handle.net/1721.1/76206
Department
Massachusetts Institute of Technology. Department of Physics
Journal
Physical Review D
Publisher
American Physical Society
Citation
Di Valentino, Eleonora et al. “Parametrized Modified Gravity and the CMB Bispectrum.” Physical Review D 86.6 (2012). © 2012 American Physical Society
Version: Final published version
ISSN
1550-7998
1089-4918

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