Creating Naked Singularities and Negative Energy

TL;DR

This paper reviews recent classical gravitational solutions that challenge cosmic censorship and positive energy theorems, including matter theories with negative energies and supersymmetric configurations with negative effective energy density.

Contribution

It presents new examples of classical solutions in gravitational theories that violate cosmic censorship and positive energy conditions, even in supersymmetric contexts.

Findings

Matter theories violating cosmic censorship with positive energy

Supersymmetric solutions with arbitrarily negative gravitational energy

Compactifications with negative four-dimensional effective energy density

Abstract

A brief review is given of three recent results concerning classical solutions of gravitational theories: (1) With asymptotically anti de Sitter boundary conditions, there are matter theories satisfying the positive energy theorem which violate cosmic censorship. (2) Despite supersymmetry, there are solutions to N=8 supergravity in which the total gravitational energy is arbitrarily negative. This theory can also violate cosmic censorship. (3) A large class of supersymmetric compactifications (including all simply connected Calabi-Yau manifolds) have solutions with negative four dimensional effective energy density.