Nonlinear Structure Formation with the Environmentally Dependent Dilaton

Abstract

We have studied the nonlinear structure formation of the environmentally dependent dilaton model using $N$-body simulations. We find that the mechanism of suppressing the scalar fifth force in high-density regions works very well. Within the parameter space allowed by the solar system tests, the dilaton model predicts small deviations of the matter power spectrum and the mass function from their $\Lambda$CDM counterparts. The importance of taking full account of the nonlinearity of the model is also emphasized.

14 pages; 7 figures

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