The Cosmological Constant as Event Horizon

TL;DR

This paper proposes that the cosmological constant corresponds to an event horizon, suggesting our universe is a black hole-like structure that can explain large-scale structure without inflation or dark energy.

Contribution

It introduces a novel interpretation of the cosmological constant as an event horizon, proposing a black hole universe model that negates the need for inflation or dark energy.

Findings

Universe's expansion inside its Schwarzschild radius

Large-scale structure formation without inflation or dark energy

Cosmological constant as a causal boundary term

Abstract

General Relativity allows for a cosmological constant ($\Lambda$) which has inspired models of cosmic Inflation and Dark Energy. We show instead that $r_\Lambda = \sqrt{3/\Lambda}$ corresponds to an event horizon: a causal boundary term in the action. Our Universe is expanding inside its Schwarzschild radius $r_S=\rL=2GM$, which could have originated from a uniform free falling cloud of mass $M$ that collapsed as a Black Hole (BH) 25 Gyrs ago. Such a BH Universe allows for large-scale structure formation without the need of Inflation or Dark Energy.