Perfect Fluid Space-times with a Two-dimensional Orthogonally - Transitive Group of Homothetic Motions

Computer Science

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We use the ghp formalism to obtain perfect fluid space-times with a two-dimensional and orthogonally transitive group of proper homothetic motionsH 2, with the additional condition that the four-velocity of the fluid either lies on the group orbits or is orthogonal to them. In the first case the orbits of theH 2 are timelike and all possible solutions are explicitly given. They comprise (i) space-times of Petrov type I that admit a groupH 3 containing two hypersurface orthogonal and commuting Killing vectors (when theH 2 is abelian, the fluid has a stiff equation of state and the space-time is of type D), and (ii) a class of type D static space-times with a maximalH 2 in which the two-spaces orthogonal to the group orbits have constant curvature. When the orbits of theH 2 are spacelike, the fluid is necessarily stiff and different classes of solutions admitting maximalH 2 andH 3 are identified.

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