Nonlinear growth in modified gravity theories of dark energy

Abstract

Theoretical differences in the growth of structure offer the possibility that we might distinguish between modified gravity theories of dark energy and \LambdaCDM. A significant impediment to applying current and prospective large scale galaxy and weak lensing surveys to this problem is that, while the mildly nonlinear regime is important, there is a lack of numerical simulations of nonlinear growth in modified gravity theories. A major question exists as to whether existing analytical fits, created using simulations of standard gravity, can be confidently applied. In this paper we address this, presenting results of N-body simulations of a variety of models where gravity is altered including the Dvali, Gabadadze and Porrati model. We consider modifications that alter the Poisson equation and also consider the presence of anisotropic shear stress that alters how particles respond to the gravitational potential gradient. We establish how well analytical fits of the matter power spectrum by Peacock and Dodds and Smith et al. are able to predict the nonlinear growth found in the simulations from z=50 up to today, and also consider implications for the weak lensing convergence power spectrum. We find that the analytical fits provide good agreement with the simulations, being within 1σof the simulation results for cases with and without anisotropic stress and for scale-dependent and independent modifications of the Poisson equation. No strong preference for either analytical fit is found.

14 pages, 11 figures, updated to version published in Phys. Rev. D77, including additional discussion and references

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• Density perturbations in f(R) gravity theories in metric and Palatini formalisms
• Growth factor parametrization and modified gravity
• N-Body Simulations of DGP and Degravitation Theories
• Vacuum structure for scalar cosmological perturbations in Modified Gravity Models
• The effect of modified gravity on weak lensing
• Consistent perturbations in an imperfect fluid
• Microscopic and Macroscopic Behaviors of Palatini Modified Gravity Theories
• Growth factor parametrization in curved space
• Growth of Cosmic Structure
• Constraining Modified Gravity with Euclid
• Three-Point Correlations in f(R) Models of Gravity
• Testing modified gravity models with recent cosmological observations
• Simulation techniques for modified gravity
• Merger history trees of dark matter haloes in moving barrier models
• Simulations of structure formation in interacting dark energy cosmologies
• Data-driven and Almost Model-independent Reconstruction of Modified Gravity
• Constraints on scalar-tensor theories of gravity from observations
• The Distinguishability of Interacting Dark Energy from Modified Gravity
• Bayesian deep learning for cosmic volumes with modified gravity
• Density pertubation of unparticle dark matter in the flat Universe