Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2008-07-28
Class.Quant.Grav.25:195007,2008
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
14 pages. Accepted by Class. Quant. Grav. Some misprints fixed
Scientific paper
10.1088/0264-9381/25/19/195007
Supersymmetric solutions of supergravity theories, and consequently metrics with special holonomy, have played an important role in the development of string theory. We describe how a Lorentzian manifold is either completely reducible, and thus essentially known, or not completely reducible so that there exists a degenerate holonomy invariant lightlike subspace and consequently admits a covariantly constant or a recurrent null vector and belongs to the higher-dimensional Kundt class of spacetimes. These Kundt spacetimes (which contain the vanishing and constant curvature invariant spacetimes as special cases) are genuinely Lorentzian and have a number of interesting and unusual properties, which may lead to novel and fundamental physics.
Brännlund Johan
Coley Alan A.
Hervik Sigbjorn
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