A new source for a braneworld cosmological constant from a modified gravity model in the bulk

TL;DR

This paper proposes a modified gravity model in the bulk that generates a four-dimensional cosmological constant from a perfect fluid, linking bulk properties to brane cosmology.

Contribution

It introduces a novel gravity model with non-minimal coupling that derives a brane cosmological constant from bulk perfect fluid dynamics.

Findings

A four-dimensional cosmological constant emerges from bulk perfect fluid.

The model links bulk fluid properties to brane cosmological equations.

Boundary conditions determine the induced brane equations.

Abstract

We show that a four-dimensional equation of state for a cosmological constant term arises from a perfect fluid in the bulk in the context of a gravity model where the scalar curvature is non-minimally coupled to the perfect fluid Lagrangian density. The four-dimensional theory is fully determined from the induced equations on the brane, subject to the boundary conditions derived across the brane.