# Regularized big bang singularity

## TL;DR

This paper extends a regularization technique to the big bang singularity, removing divergences by introducing a spacetime defect, and proposes the possibility of a pre-big-bang phase.

## Contribution

It applies a regularization method from black hole solutions to cosmological singularities, revealing a new spacetime structure and a potential pre-big-bang phase.

## Key findings

- Divergences at the big bang are regularized with a spacetime defect.
- The regularization implies a vanishing metric determinant at the defect.
- A pre-big-bang phase is suggested by the regularization.

## Abstract

Following up on earlier work on the regularization of the singular Schwarzschild solution, we now apply the same procedure to the singular Friedmann solution. Specifically, we are able to remove the divergences of the big bang singularity, at the price of introducing a 3-dimensional spacetime defect with a vanishing determinant of the metric. This particular regularization also suggests the existence of a "pre-big-bang" phase.