Naked Singularity Explosion in Higher Dimensions

TL;DR

This paper studies quantum particle creation during naked singularity formation in higher-dimensional spacetimes, revealing significant energy emission that could influence gravitational dynamics in high-energy particle collisions.

Contribution

It extends the analysis of quantum radiation from naked singularities to higher dimensions using self-similar Vaidya models, highlighting the importance of backreaction effects.

Findings

Emission power diverges near the Cauchy horizon

Power scales as inverse quadratic of remaining time in generic cases

Power scales as inverse quartic in degenerate cases

Abstract

Motivated by the recent argument that in the TeV-scale gravity trans-Planckian domains of spacetime as effective naked singularities would be generated by high-energy particle (and black-hole) collisions, we investigate the quantum particle creation by naked-singularity formation in general dimensions. Background spacetime is simply modeled by the self-similar Vaidya solution, describing the spherical collapse of a null dust fluid. In a generic case the emission power is found to be proportional to the quadratic inverse of the remaining time to a Cauchy horizon, as known in four dimensions. On the other hand, the power is proportional to the quartic inverse for a critical case in which the Cauchy horizon is `degenerate'. According to these results, we argue that the backreaction of the particle creation to gravity will be important in particle collisions, in contrast to the gravitational collapse of massive stellar objects, since the bulk of energy is carried away by the quantum radiation even if a quantum gravitational effect cutoff the radiation just before the appearance of naked singularity.