AIP Digital Archive
Alternative pairs of impulsive pp waves (accompanied by shocks) that interact to produce a Kerr geometry are compared. In one case, discovered by Chandrasekhar and Xanthopoulos [Proc. R. Soc. London Ser. A 408, 175 (1986)], analytic extension across the horizon revealed a timelike singularity analogous to the ring singularity of the Kerr metric. In another, presented here for the first time, analytic extension across the horizon reveals instead an asymptotically flat exterior Kerr geometry. The pp wave pulse shapes that result in the formation of these two different Kerr interaction regions are displayed graphically.
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