Cosmic coincidence or graviton mass?

TL;DR

This paper explores how a small graviton mass, derived from quantum corrections to cosmological equations, could explain the smallness of vacuum energy and the coincidence of dark energy dominance in the universe.

Contribution

It introduces a novel approach linking quantum-corrected Friedmann equations with a small graviton mass to address fundamental cosmological problems.

Findings

Proposes a quantum gravity-based resolution to the smallness problem.

Suggests a graviton mass consistent with observations.

Provides a potential explanation for the coincidence problem.

Abstract

Using the quantum corrected Friedmann equation, obtained from the quantum Raychudhuri equation, and assuming a small mass of the graviton (but consistent with observations and theory), we propose a resolution of the smallness problem(why is observed vacuum energy so small?) and the coincidence problem(why does it constitute most of the universe, about 70%, in the current epoch?).