Inaccessible Singularities in Toral Cosmology

TL;DR

This paper explores a new type of initial singularity in toral cosmology that is inaccessible to physical probes, expanding the understanding of possible cosmological singularities beyond traditional Bang/Crunch models.

Contribution

It introduces the concept of inaccessible singularities in toral cosmology as a novel initial state, differing from traditional accessible singularities.

Findings

Inaccessible singularities naturally occur in cosmologies with toral spatial sections.

These singularities are characterized by their inaccessibility to well-defined physical probes.

The study broadens the classification of cosmological singularities beyond conventional models.

Abstract

The familiar Bang/Crunch singularities of classical cosmology have recently been augmented by new varieties: rips, sudden singularities, and so on. These tend to be associated with final states. Here we consider an alternative possibility for the initial state: a singularity which has the novel property of being inaccessible to physically well-defined probes. These singularities arise naturally in cosmologies with toral spatial sections.