Colliding gravitational waves in expanding cosmologies

Details Colliding gravitational waves in expanding cosmologies Colliding gravitational waves in expanding cosmologies

Feb 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982phrvd..25..930c&link_type=abstract

Physical Review D (Particles and Fields), Volume 25, Issue 4, 15 February 1982, pp.930-941

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We discuss the singularity behavior and causal structure of expanding vacuum plane-symmetric cosmologies containing colliding gravitational waves. Penrose's theorem excluding global Cauchy hypersurfaces in plane-wave spacetimes does not hold for our expanding cosmologies. The singularity in our solutions occurs in the past and can be identified with the big-bang singularity. Analytical estimates based on a Green's-function analysis near the collision provide an explicit example which is verified by numerical computation.

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