In general relativity, a gravitational plane wave (or plane gravitational wave) is defined to be any non-flat solution to Einstein's empty space-time field equations, which has the same symmetries as a plane electromagnetic wave. They are a special class of a vacuum pp-wave spacetime.
In general relativity, a gravitational plane wave (or plane gravitational wave) is defined to be any non-flat solution to Einstein's empty space-time field equations, which has the same symmetries as a plane electromagnetic wave. They are a special class of a vacuum pp-wave spacetime.
Source: Wikipedia "Gravitational plane wave" · CC BY-SA 4.0
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