Nonlinear Structure Formation with the Environmentally Dependent Dilaton

TL;DR

This paper uses N-body simulations to study how an environmentally dependent dilaton model affects nonlinear structure formation, showing effective suppression of fifth forces and small deviations from standard cosmology within solar system constraints.

Contribution

It provides the first detailed nonlinear analysis of the dilaton model using simulations, highlighting the importance of nonlinearity and its observational implications.

Findings

Fifth force suppression is highly effective in high-density regions.

Deviations in matter power spectrum are small within allowed parameter space.

Nonlinearity plays a crucial role in the model's behavior.

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.