The no-boundary proposal via the five-dimensional Friedmann-Lemaitre-Robertson-Walker model

TL;DR

This paper explores an alternative to Hawking's no-boundary proposal using a five-dimensional FLRW model, offering a different perspective on the universe's boundary conditions.

Contribution

It introduces a novel approach to the no-boundary proposal through a five-dimensional cosmological model, bypassing the need for imaginary time.

Findings

Proposes a five-dimensional FLRW model as an alternative to imaginary time.

Provides a new framework for understanding the universe's boundary conditions.

Suggests potential implications for quantum cosmology theories.

Abstract

Hawking's proposal that the Universe has no temporal boundary and hence no beginning depends on the notion of imaginary time and is usually referred to as the "no-boundary proposal." This paper discusses a simple alternative approach by means of the five-dimensional Friedmann-Lemaitre-Robertson-Walker model.