The strong coupling effect and auxiliary fields in the DGP-model

TL;DR

This paper explores modifications to the DGP-model by adding auxiliary scalar fields that eliminate the strong coupling mode, maintaining the same effective four-dimensional theory on the brane.

Contribution

It introduces a novel approach using auxiliary fields with special couplings to remove the strong coupling mode in the DGP-model.

Findings

The auxiliary fields exclude the strong coupling mode.

The effective four-dimensional theory remains unchanged.

The modified model preserves the original DGP-model's predictions.

Abstract

The DGP-model with additional terms in the action is considered. These terms have a special form and include auxiliary scalar fields without kinetic terms, which are non-minimally coupled to gravity. The use of these fields allows one to exclude the mode, which corresponds to the strong coupling effect, from the theory. Effective four-dimensional theory on the brane appears to be the same, as in the original DGP-model.