Effective fluid mixture of tensor-multi-scalar gravity

TL;DR

This paper extends the effective fluid approach to tensor-multi-scalar gravity, treating the scalar fields as a complex, coupled fluid mixture and exploring different reference frames for analysis.

Contribution

It introduces a generalized effective fluid framework for tensor-multi-scalar gravity, addressing the complexities of coupled scalar fields and multiple reference frames.

Findings

Identifies challenges in representing coupled scalar fields as an effective fluid.

Highlights the physical implications of different reference frames.

Provides a foundation for analyzing tensor-multi-scalar gravity using fluid dynamics.

Abstract

We apply to tensor-multi-scalar gravity the effective fluid analysis based on the representation of the gravitational scalar field as a dissipative effective fluid. This generalization poses new challenges as the effective fluid is now a complicated mixture of individual fluids mutually coupled to each other and many reference frames are possible for its description. They are all legitimate, although not all convenient for specific problems, and they give rise to different physical interpretations. Two of these frames are highlighted.