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Gowdy solution
Gowdy universes or, alternatively, Gowdy solutions of Einstein's equations are simple model spacetimes in general relativity which represent an expanding universe filled with a regular pattern of gravitational waves.
External links
Scholarpedia article on the subject written by Robert H. Gowdy.
Gowdy, Robert H. (2007), "Of gravitational waves and spherical chickens", [http://www.einstein-online.info/en Einstein Online] – a description of the different types of Gowdy universes suitable for a general audience
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