Killing Reduction of 5-Dimensional Spacetimes

Details Killing Reduction of 5-Dimensional Spacetimes Killing Reduction of 5-Dimensional Spacetimes

2003-07-12

arxiv.org/abs/gr-qc/0307061v2

Phys.Rev. D68 (2003) 024006

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

9 pages, references added

Scientific paper

10.1103/PhysRevD.68.024006

In a 5-dimensional spacetime ($M,g_{ab}$) with a Killing vector field $\xi ^a$ which is either everywhere timelike or everywhere spacelike, the collection of all trajectories of $\xi ^a$ gives a 4-dimensional space $S$. The reduction of ($M,g_{ab}$) is studied in the geometric language, which is a generalization of Geroch's method for the reduction of 4-dimensional spacetime. A 4-dimensional gravity coupled to a vector field and a scalar field on $S$ is obtained by the reduction of vacuum Einstein's equations on $M$, which gives also an alternative description of the 5-dimensional Kaluza-Klein theory. Besides the symmetry-reduced action from the Hilbert action on $M$, an alternative action of the fields on $S$ is also obtained, the variations of which lead to the same fields equations as those reduced from the vacuum Einstein equation on $M$.

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