Large Scale Lorentz Violation Gravity and Dark Energy

TL;DR

This paper proposes that large-scale Lorentz violation, originating from quantum gravity effects in the early universe, could explain dark energy and the universe's accelerated expansion.

Contribution

It introduces an effective gravity model with local SO(3) symmetry that links Lorentz violation to dark energy phenomena.

Findings

Contortion distribution contributes to dark energy effects.

The theory produces a FRW-like solution with accelerated expansion.

Dark energy may be a remnant of quantum gravity effects.

Abstract

The accelerating expansion of universe can be described by the non-zero cosmological constant or the dark energy. However, the origin of the dark energy remains a mystery of modern physics. The local Lorentz invariance is the most exact symmetry of the Nature on the one hand, but all quantum gravity theories predict Lorentz violation on the other hand. The local Lorentz violation induced by the quantum gravity at the very early universe may be transformed into large scale by inflation. Combining the low-$l$ anomalies of the CMB spectrum, we propose that the local Lorentz invariance may be broken at the large scale. We construct the effective gravity at the cosmic scale with a local $SO(3)$ symmetry. The theory exhibits non-trivial contortion distribution even with scalar matter source. The FRW like solution of the theory is analyzed and the contortion distribution contributes a dark energy like effect which is responsible for the accelerating expansion of the universe. It reveals that the dark energy may be the remnants of quantum gravity in this sense.