Non-existence of Asymptotically Flat Geons in 2+1 Gravity

Details Non-existence of Asymptotically Flat Geons in 2+1 Gravity Non-existence of Asymptotically Flat Geons in 2+1 Gravity

2008-09-17

arxiv.org/abs/0809.3022v2

Class.Quant.Grav.26:075012,2009

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

22 pages. Typos fixed. Clarified proof of Corollary 2 provided. Discussion of applicability to other theories of 2+1 gravity,

Scientific paper

10.1088/0264-9381/26/7/075012

Geons, small topological structures that exhibit particle properties such as charge and angular momentum without the presence of matter sources, have been extensively discussed in 3+1-dimensional general relativity. Given the recent renewal of interest in 2+1 gravity, it is natural to ask whether or not the notion of geons extends to three dimensions. We prove here that, in contrast to the 3+1-dimensional case, there are no 2+1-dimensional asymptotically flat solutions of the vacuum Einstein or Einstein-Maxwell equations containing geons. In contrast, 2+1-dimensional asymptotically anti-de Sitter spacetimes can indeed contain geons; however, the geons are always hidden behind a single black hole horizon. We also prove sufficient conditions for the non-existence of 2+1-dimensional asymptotically flat geon-containing solutions.

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