Vacuum energy, holography and a quantum portrait of the visible Universe

TL;DR

This paper models the observable Universe as a graviton condensate to explain the quantum vacuum energy, suggesting it naturally aligns with the critical energy density observed today.

Contribution

It introduces a quantum graviton condensate framework to explain the value of the vacuum energy in the Universe.

Findings

Vacuum energy is of the order of the critical energy density.

Universe can be described as a graviton condensate with large occupation number.

Model provides a quantum portrait linking holography and cosmology.

Abstract

Describing the presently observable Universe as a self-sustained condensate of gravitons of size $H_0^{-1}$, with large occupation number $N$, we argue that the most probable value for the quantum vacuum energy is of the order of the critical energy density, as observed.