Repulsive gravity model for dark energy

TL;DR

This paper proposes a multimetric gravity theory with multiple matter sectors, where inter-sector repulsion can explain cosmic acceleration, providing a novel approach to dark energy rooted in standard model copies.

Contribution

It introduces a multimetric gravity model with N >= 3 sectors, demonstrating repulsive inter-sector gravity and its potential to explain dark energy.

Findings

Repulsive gravity between different matter sectors is possible for N >= 3.

The model can account for the universe's accelerated expansion.

Dark energy may originate from interactions between dark copies of the standard model.

Abstract

We construct a multimetric gravity theory containing N >= 3 copies of standard model matter and a corresponding number of metrics. In the Newtonian limit, this theory generates attractive gravitational forces within each matter sector, and repulsive forces of the same strength between matter from different sectors. This result demonstrates that the recently proven no-go theorem that forbids gravity theories of this type in N = 2 cannot be extended beyond the bimetric case. We apply our theory to cosmology and show that the repulsion between different types of matter may induce the observed accelerating expansion of the universe. In this way dark energy can be explained simply by dark copies of the well-understood standard model.