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Non existence of static multi-black-hole solutions in 2+1 dimensions

Published online by Cambridge University Press:  05 November 2011

O. Coussaert
Affiliation:
Université Libre de Bruxelles
M. Henneaux
Affiliation:
Centro de Estudios Científicos de Santiago
John M. Charap
Affiliation:
Queen Mary University of London
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Summary

Abstract

It is shown that there is no static pure multi-black-hole solution of the (2+1)-Einstein equations with negative cosmological constant. The result is extended to the stationnary case and to the Einstein-Maxwell theory, for which the absence of pure multi-black hole solutions with freely specifiable positions is also established.

Introduction

Four-dimensional Einstein-Maxwell theory admits remarkable static multiblack-hole metrics in which the electrostatic repulsion exactly balances the gravitational attraction [1, 2, 3]. These solutions have the following important properties.

  1. (i) each black hole contained in the solutions is of the extreme Reissner-Nordstrom type, i.e., has its mass equal to its charge;

  2. (ii) the relative positions of the individual black holes are free parameters that can be specified independly of their masses (the exact balance between the electromagnetic repulsion and the gravitational attraction holds for any configuration); and

  3. (ii) all the multi-black hole solutions have some exact supersymmetries [4, 5, 6]; actually, they are the only black hole solutions with this property.

Recently, three-dimensional metrics describing single black holes have been found in the context of the Einstein theory with a negative cosmological constant [7]. Even though the single (2+1)-black hole solutions occur in a much simpler setting, they share global causal properties quite similar to their (3+1)-parents [8].

The purpose of this note is to investigate whether one can construct static multi-black-hole solutions in 2+1 dimensions. We show that this is not possible, in spite of the fact that multiparticle solutions are known to exist for (2+1)-Einstein theory with zero cosmological constant [9].

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Publisher: Cambridge University Press
Print publication year: 1995

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