Effect of fast scale factor fluctuations on cosmological evolution

TL;DR

This paper investigates how rapid quantum fluctuations of the universe's scale factor can alter cosmological equations, potentially explaining late-time acceleration and modifying galaxy-scale dynamics.

Contribution

It introduces a model where fast scale factor fluctuations modify Friedmann equations, offering a novel approach to the cosmological constant problem and galaxy dynamics.

Findings

Quantum fluctuations induce late-time accelerated expansion.

Fluctuations significantly modify the effective universe potential.

Alterations could impact Newtonian dynamics at galaxy scales.

Abstract

In this paper we study the corrections to the Friedmann equations due to fast fluctuations of the universe scale factor. Such fast quantum fluctuations were recently proposed as a potential solution of the cosmological constant problem. They also induce strong changes to the current sign and magnitude of the average cosmological force, thus making it one of the potential probable causes for the modification of Newtonian dynamics in galaxy-scale systems. It appears that quantum fluctuations of the scale factor also modify the Friedmann equations, leading to considerable modification of cosmological evolution. In particular, they give rise to late-time accelerated expansion of the universe, and they may also considerably modify the effective universe potential.