Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1972
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1972natur.235..379m&link_type=abstract
Nature, Volume 235, Issue 5338, pp. 379-380 (1972).
Astronomy and Astrophysics
Astronomy
Scientific paper
IMPORTANT information in astronomy may be gained in the not-too-distant future by the observation of gravitational waves. But the nonlinearity of the gravitational field equations in general relativity makes it difficult to estimate effects which might arise through collisions between waves, even when the nature of the impinging waves is known. In general, direct superposition of solutions for individual waves will lead to violation of the vacuum equations. One thus has to determine, in a particular situation, whether there exists a valid vacuum solution, non-singular in the wave region, which represents the gravitational field before, during and after the collision, or whether instead the eventual formation of physical singularities is predicted. For example, Penrose1 has shown that in the collision of (exact) weak ``sandwich'' plane waves2, each will warp the other until singularities occur in the wave-front.
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