Entropy Bounds and Dark Energy

TL;DR

This paper explores how entropy bounds can make quantum corrections to the cosmological constant finite, potentially explaining dark energy density, but faces observational challenges due to the predicted equation of state.

Contribution

It proposes a framework where entropy bounds lead to a finite quantum correction to $ abla$, connecting it to dark energy and dark matter.

Findings

Quantum corrections to $ abla$ are finite due to entropy bounds.

Predicted dark energy equation of state $w=0$ is inconsistent with observations.

$ abla$ could explain dark matter component instead of dark energy.

Abstract

Entropy bounds render quantum corrections to the cosmological constant $\Lambda$ finite. Under certain assumptions, the natural value of $\Lambda$ is of order the observed dark energy density $\sim 10^{-10} {\rm eV}^4$, thereby resolving the cosmological constant problem. We note that the dark energy equation of state in these scenarios is $w \equiv p / \rho = 0$ over cosmological distances, and is strongly disfavored by observational data. Alternatively, $\Lambda$ in these scenarios might account for the diffuse dark matter component of the cosmological energy density.