Big Bang as spacetime defect

TL;DR

This paper explores a novel approach to resolving the Big Bang singularity by introducing a degenerate spacetime metric with a spacelike defect, potentially revealing a new 'side' of the Big Bang and related wormhole solutions.

Contribution

It proposes a new class of solutions with degenerate metrics to eliminate the Big Bang singularity and discusses the implications of a spacetime defect in cosmology.

Findings

Elimination of the Big Bang curvature singularity.

Existence of a 'pre-Big-Bang' phase alternative.

Introduction of defect wormhole solutions.

Abstract

We review the suggestion that it is possible to eliminate the Big Bang curvature singularity of the Friedmann cosmological solution by considering a particular type of degenerate spacetime metric. Specifically, we take the 4-dimensional spacetime metric to have a spacelike 3-dimensional defect with a vanishing determinant of the metric. This new solution suggests the existence of another "side" of the Big Bang (perhaps a more appropriate description than "pre-Big-Bang" phase used in our original paper). The corresponding new solution for defect wormholes is also briefly discussed.