All electro--vacuum Majumdar--Papapetrou space--times with nonsingular black holes

TL;DR

This paper proves that all non-singular, electrovacuum Majumdar--Papapetrou space-times with black holes are the standard solutions, clarifying their uniqueness and structure.

Contribution

It establishes the uniqueness of non-singular Majumdar--Papapetrou space-times with black holes, showing they must be the standard solutions.

Findings

All such space-times are the standard Majumdar--Papapetrou solutions.

Non-singular black hole regions imply standard space-time structures.

The results clarify the structure of electrovacuum black hole space-times.

Abstract

We show that all Majumdar--Papapetrou electrovacuum space--times with a non--empty black hole region and with a non--singular domain of outer communications are the standard Majumdar--Papapetrou space--times.