Philippe Brax, Anne-Christine Davis, Baojiu Li, Hans A. Winther, Gong-Bo Zhao
We study the linear and nonlinear structure formation in the dilaton and symmetron modified gravity models using a generic parameterisation which describes a large class of scenarios using only a few parameters. For this we have modified the $N$-body code {\tt ECOSMOG} to perform a set of 110 simulations for different models and parameter values, including the default $\Lambda$CDM. These simulations enable us to explore a large portion of the parameter space. We have studied the effects of modified gravity on the matter power spectrum and mass function, and found rich and interesting phenomenology. The results reveal the qualitative behaviour of the models, and provide guidance for future more detailed studies.
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http://arxiv.org/abs/1206.3568
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