Searching for modified growth patterns with tomographic surveys

Abstract

In alternative theories of gravity, designed to produce cosmic acceleration at the current epoch, the growth of large scale structure can be modified. We study the potential of upcoming and future tomographic surveys such as DES and LSST, with the aid of CMB and supernovae data, to detect departures from the growth of cosmic structure expected within General Relativity. We employ parametric forms to quantify the potential time- and scale-dependent variation of the effective gravitational constant, and the differences between the two Newtonian potentials. We then apply the Fisher matrix technique to forecast the errors on the modified growth parameters from galaxy clustering, weak lensing, CMB, and their cross-correlations across multiple photometric redshift bins. We find that even with conservative assumptions about the data, DES will produce non-trivial constraints on modified growth, and that LSST will do significantly better.

Matches the version accepted to PRD. New plots, typos fixed, references added. The MGCAMB code is available at http://www.sfu.ca/~gza5/MGCAMB.html

References in corpus (19)

• Models of f(R) Cosmic Acceleration that Evade Solar-System Tests
• A Parameterized Post-Friedmann Framework for Modified Gravity
• A discriminating probe of gravity at cosmological scales
• f(R) Gravity and Chameleon Theories
• Distinguishing Modified Gravity from Dark Energy
• Combined analysis of the integrated Sachs-Wolfe effect and cosmological implications
• Degravitation of the Cosmological Constant and Graviton Width
• The bispectrum of galaxies from high-redshift galaxy surveys: primordial non-Gaussianity and non-linear galaxy bias
• A Singularity Problem with f(R) Dark Energy
• Non-linear evolution of f(R) cosmologies II: power spectrum
• Relativistic stars in f(R) gravity, and absence thereof
• Constraining Interactions in Cosmology's Dark Sector
• Cosmological Constraints on f(R) Acceleration Models
• Constraints on a New Post-General Relativity Cosmological Parameter
• Parametrized Post-Friedmann Signatures of Acceleration in the CMB
• Adiabatic instability in coupled dark energy-dark matter models
• A sub-horizon framework for probing the relationship between the cosmological matter distribution and metric perturbations
• Cosmological perturbations in the DGP braneworld: numeric solution
• Large Scale Structure Formation of Normal Branch in DGP Brane World Model

Cited by in corpus (4)

• Approaches to Understanding Cosmic Acceleration
• Non-linear Evolution of Matter Power Spectrum in Modified Theory of Gravity
• Early Dark Energy at High Redshifts: Status and Perspectives
• Lenses in the forest: cross-correlation of the Lyman-alpha flux with CMB lensing