Gravitational collapse and naked singularities

TL;DR

This paper discusses the phenomenon of gravitational collapse leading to naked singularities, explores the concept of effective naked singularities, and considers their implications for new physics beyond classical general relativity.

Contribution

It introduces the concept of effective naked singularities and reviews recent examples of naked singularity formation in physically reasonable matter collapse.

Findings

Examples of naked singularities in realistic matter collapse

Proposal of the concept of effective naked singularities

Implication for new physics in strongly curved spacetimes

Abstract

Gravitational collapse is one of the most striking phenomena in gravitational physics. The cosmic censorship conjecture has provided strong motivation for researches in this field. In the absence of general proof for the censorship, many examples have been proposed, in which naked singularity is the outcome of gravitational collapse. Recent development has revealed that there are examples of naked singularity formation in the collapse of physically reasonable matter fields, although the stability of these examples is still uncertain. We propose the concept of ``effective naked singularities'', which will be quite helpful because general relativity has the limitation of its application for high-energy end. The appearance of naked singularities is not detestable but can open a window for new physics of strongly curved spacetimes.