Cosmological expansion governed by a scalar field from a 5D vacuum

TL;DR

This paper models the universe's expansion using a scalar field derived from a five-dimensional vacuum, capturing multiple evolutionary phases from inflation to vacuum domination.

Contribution

It introduces a novel 5D vacuum framework that effectively describes the universe's expansion history with a scalar field, encompassing various epochs.

Findings

Universe undergoes inflation, deceleration, acceleration, and vacuum domination.

Effective 4D description captures different cosmic epochs.

Scalar field from 5D vacuum governs the expansion dynamics.

Abstract

We consider a single field governed expansion of the universe from a five dimensional (5D) vacuum state. Under an appropiate change of variables the universe can be viewed in a effective manner as expanding in 4D with an effective equation of state which describes different epochs of its evolution. In the example here worked the universe fistly describes an inflationary phase, followed by a decelerated expansion. Thereafter, the universe is accelerated and describes a quintessential expansion to finally, in the future, be vacuum dominated.