Spacetimes admitting a three-parameter group of isometries and quasilocal gravitational mass

Physics

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Scientific paper

Spacetimes admitting a three-parameter group of motions multiply transitive on two-dimensional spacelike orbits allow construction of a simple geometrical invariant out of the magnitudes of Killing fields, their gradients, and the metric. We show that this invariant covariantizes and geometrizes certain forms of ``quasilocal mass'' introduced and discussed in the literature, in particular, Misner's mass in spherical symmetry and Taub's ``mass'' in plane symmetry.

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