Passing to an effective 4D phantom cosmology from 5D vacuum theory of gravity

TL;DR

This paper explores how 5D vacuum gravity theories can induce 4D phantom cosmologies using symmetry transformations, leading to models with de-Sitter expansion and a time-varying cosmological parameter.

Contribution

It introduces a method to generate 4D phantom cosmologies from 5D vacuum theories via form-invariance symmetry transformations, applied to two different cosmological scenarios.

Findings

Induced 4D de-Sitter expansion model.

A 4D model with a decreasing cosmological parameter Λ(t).

Demonstrates the viability of deriving phantom scenarios from higher-dimensional theories.

Abstract

Starting from a five-dimensional (5D) vacuum theory of gravity where the extra coordinate is considered as noncompact, we investigate the possibility of inducing four-dimensional (4D) phantom scenarios by applying form-invariance symmetry transformations. In particular we obtain phantom scenarios for two cosmological frameworks. In the first framework we deal with an induced 4D de-Sitter expansion and in the second one a 4D induced model where the expansion of the universe is dominated by a decreasing cosmological parameter $\Lambda(t)$ is discussed.