Fixing cosmological constant on the event horizon

TL;DR

This paper proposes fixing the cosmological constant at the event horizon using unimodular and thermodynamic gravity approaches, providing a new way to determine its observed value.

Contribution

It introduces a novel method of fixing the cosmological constant at the event horizon within unimodular and thermodynamic gravity frameworks.

Findings

Cosmological constant fixed at the event horizon matches observed value

Unimodular and thermodynamic approaches yield consistent results

Provides a new perspective on dark energy and cosmic acceleration

Abstract

Standard cosmological equations are written for the Hubble volume, while the real boundary of space-time is the event horizon. Within the unimodular and thermodynamic approaches to gravity, the dark energy term in cosmological equations appears as an integration constant, which we fix at the event horizon and obtain the observed value for the cosmological constant.