Parametrized modified gravity and the CMB bispectrum

2012/04/24 by Eleonora Di Valentino, Alessandro Melchiorri, A. Melchiorri +2
Earth and Planetary Sciences · Mathematics · Physics and Astronomy · #Anisotropy #Astrophysics #Bispectrum #Cosmic microwave background #Cosmology and Gravitation Theories #Economics #Galaxies: Formation, Evolution, Phenomena #Geophysics and Gravity Measurements #Mathematics #Metric (unit) #Physics #Quantum mechanics #Spectral density #Statistical physics #Statistics #Theoretical physics #astro-ph.CO #gr-qc #hep-ph

paper · pdf · doi:10.1103/physrevd.86.063517

7 pages, 6 figures

arxiv created 2012/04/24 · openalex publication_date 2012/09/19 · arxiv updated 2013/02/12 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

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.

Citations

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