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Vacuum plane waves in 4+1 D and exact solutions to Einstein's equations in 3+1 D

Sigbjørn Hervik

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In this paper, we derive homogeneous vacuum plane-wave solutions to Einstein's field equations in 4+1 dimensions. The solutions come in five different types of which three generalize the vacuum plane-wave solutions in 3+1 dimensions to the (4+1)-dimensional case. By doing a Kaluza–Klein reduction we obtain solutions to the Einstein–Maxwell equations in 3+1 dimensions. The solutions generalize the vacuum plane-wave spacetimes of Bianchi class B to the non-vacuum case and describe spatially homogeneous spacetimes containing an extremely tilted fluid. Also, using a similar reduction we obtain (3+1)-dimensional solutions to the Einstein equations with a scalar field.


PACS

04.20.Jb Exact solutions

04.50.-h Higher-dimensional gravity and other theories of gravity

04.40.Nr Einstein-Maxwell spacetimes, spacetimes with fluids, radiation or classical fields

04.25.-g Approximation methods; equations of motion

MSC

83C15 Exact solutions

83C10 Equations of motion

83C22 Einstein-Maxwell equations

Subjects

Gravitation and cosmology

Dates

Issue 19 (7 October 2003)

Received 2 June 2003

Published 2 September 2003



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