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.

Parametrized modified gravity and the CMB bispectrum / DI VALENTINO, Eleonora; Melchiorri, Alessandro; Salvatelli, VALENTINA MARIA; Alessandra, Silvestri. - In: PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY. - ISSN 1550-7998. - 86:6(2012). [10.1103/physrevd.86.063517]

Parametrized modified gravity and the CMB bispectrum

DI VALENTINO, ELEONORA;MELCHIORRI, Alessandro;SALVATELLI, VALENTINA MARIA;
2012

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.
2012
01 Pubblicazione su rivista::01a Articolo in rivista
Parametrized modified gravity and the CMB bispectrum / DI VALENTINO, Eleonora; Melchiorri, Alessandro; Salvatelli, VALENTINA MARIA; Alessandra, Silvestri. - In: PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY. - ISSN 1550-7998. - 86:6(2012). [10.1103/physrevd.86.063517]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/488211
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