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gr-qc2002
Closed timelike curves in general relativity
W. B. Bonnor
Many solutions of Einstein's field equations contain closed timelike curves (CTC). Some of these solutions refer to ordinary materials in situations which might occur in the labora…
gr-qc1996
Implosion of quadrupole gravitational waves
W. B. Bonnor, M. S. Piper
Einstein's vacuum equations are solved up to the second approximation for imploding quadrupole gravitational waves. The implosion generates a black hole singularity irrespective of…