Constraints on Modified Gravity from ACT and SPT

Abstract

The Atacama Cosmology Telescope (ACT) and the South Pole Telescope (SPT) have recently provided new and precise measurements of the Cosmic Microwave Background anisotropy damping tail. This region of the CMB angular spectra, thanks to the angular distortions produced by gravitational lensing, can probe the growth of matter perturbations and provide a test for general relativity. Here we make use of the ACT and SPT power spectrum measurements (combined with the recent WMAP9 data) to constrain f(R) gravity theories. Adopting a parametrized approach, we obtain an upper limit on the lengthscale of the theory of B_0 < 0.86 at 95% c.l. from ACT, while we get a significantly stronger bound from SPT with B_0 < 0.14 at 95% c.l..

6 pages, 4 figures, some sentences corrected

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Cited by in corpus (14)

• Planck 2015 results. XIV. Dark energy and modified gravity
• Effective Field Theory of Cosmic Acceleration: an implementation in CAMB
• Constraining models of $f(R)$ gravity with Planck and WiggleZ power spectrum data
• Constraining $f(R)$ gravity by the Large Scale Structure
• Halo modelling in chameleon theories
• The Integrated Sachs-Wolfe effect in $f(R)$ gravity
• Parametrized modified gravity constraints after Planck
• Qualitative analysis of Kantowski-Sachs metric in a generic class of $f(R)$ models
• Effects of Dark Energy Perturbations on Cosmological Tests of General Relativity
• On the current status of Modified Gravity
• Updated constraints from the PLANCK experiment on modified gravity
• Dark Radiation after Planck
• Cosmological Probes of Structure Growth and Tests of Gravity
• Reconstruction of f(R) gravity models from observations