On thermodynamic and quantum fluctuations of cosmological constant

TL;DR

This paper examines the potential of thermodynamic and quantum fluctuations of the cosmological constant as sources of dark energy, suggesting thermodynamic fluctuations are significantly larger and impose constraints on the universe's volume.

Contribution

It introduces a perspective that thermodynamic fluctuations of Lambda are more significant than Poisson fluctuations and derives implications for the universe's volume based on these fluctuations.

Findings

Thermodynamic fluctuations of Lambda are much larger than Poisson fluctuations.

The amplitude of fluctuations is proportional to V^{-1/2}.

Current constraints imply the universe's volume is much larger than the observable horizon.

Abstract

We discuss from the condensed-matter point of view the recent idea that the Poisson fluctuations of cosmological constant about zero could be a source of the observed dark energy. We argue that the thermodynamic fluctuations of Lambda are much bigger. Since the amplitude of fluctuations is proportional to V^{-1/2}, where V is the volume of the Universe, the present constraint on the cosmological constant provides the lower limit for V, which is much bigger than the volume within the cosmological horizon.