Cylindrical gravitational waves in expanding universes: Models for waves from compact sources
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New boundary conditions are imposed on the familiar cylindrical gravitational wave vacuum spacetimes. The new spacetime family represents cylindrical waves in a flat expanding (Kasner) universe. Space sections are flat and nonconical where the waves have not reached and wave amplitudes fall off more rapidly than they do in Einstein-Rosen solutions, permitting a more regular null inifinity.
Minor corrections to references. A note added in proof
Minor corrections to references. A note added in proof