Dark Entropy

TL;DR

This paper explores a universe where dark energy is linked to entropy, showing that a growing entropy leads to cosmic repulsion, aligning well with recent observational data.

Contribution

It proposes a novel interpretation of dark energy as entropy, connecting thermodynamics, holography, and cosmic expansion in a unified framework.

Findings

Dark energy can be viewed as entropy density of the universe.

The universe's entropy growth causes increasing cosmic repulsion.

Results align with recent observational data.

Abstract

We examine the consequences of a universe with a non-constant cosmological term in Einstein's equations and find that the Bianchi identities reduce to the first law of thermodynamics when cosmological term is identified as being proportional to the entropy density of the universe. This means that gravitating dark energy can be viewed as entropy, but more, the holographic principle along with the known expansion of the universe indicates that the entropy of the universe is growing with time and this leads to a cosmic repulsion that also grows with time. Direct implications of this result are calculated and shown to be in good accord with recent observational data.