Penrose limits of inhomogeneous space-times, their diagonalizability and twistors
Abstract
Penrose limits are considered in space-times admitting two abelian, space-like Killing vectors in vacuum as well as in the presence of an electromagnetic field. This type of space-times describe inhomogeneous cosmologies as well as colliding plane gravitational and electromagnetic waves. Following the work of Tod [1] the conditions for diagonal Penrose limits are investigated in these backgrounds. The twistor equation is considered in these space-times and solutions given in the Penrose limit.
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