Recent advances in cosmological singularities

TL;DR

This review summarizes recent developments in understanding, classifying, and addressing cosmological singularities over the past two decades, highlighting methods to avoid or mitigate these singularities in various theories.

Contribution

It provides a comprehensive overview of the types of cosmological singularities, techniques to prevent them, and their occurrence in non-conventional cosmologies, serving as a valuable resource for researchers.

Findings

Classification of recent cosmological singularities

Methods to avoid or moderate singularities

Application of dynamical systems approach

Abstract

The discovery of universe's late-time acceleration and dark energy has overseen a great deal of research into cosmological singularities and in this brief review, we discuss all the prominent developments in this field for the best part of the last 2 decades. We discuss the fundamentals of space-time singularities after which we discuss about all the different forms of cosmological singularities which have been discovered in recent times in detail. We then talk about methods and techniques to avoid or moderate these singularities in various theories and discuss how these singularities can occur in non-conventional cosmologies too. We then discuss a useful dynamical systems approach to deal with these singularities and finish up with some outlooks for the field. We hope that this work serves as a good resource to anyone who wants to update themselves with the developments in this very exciting area.