Gowdy solution
Encyclopedia
Gowdy universes or, alternatively, Gowdy solutions of Einstein's equations are simple model spacetime
s in general relativity
which represent an expanding universe
filled with a regular pattern of gravitational waves.
Spacetime
In physics, spacetime is any mathematical model that combines space and time into a single continuum. Spacetime is usually interpreted with space as being three-dimensional and time playing the role of a fourth dimension that is of a different sort from the spatial dimensions...
s in general relativity
General relativity
General relativity or the general theory of relativity is the geometric theory of gravitation published by Albert Einstein in 1916. It is the current description of gravitation in modern physics...
which represent an expanding universe
Universe
The Universe is commonly defined as the totality of everything that exists, including all matter and energy, the planets, stars, galaxies, and the contents of intergalactic space. Definitions and usage vary and similar terms include the cosmos, the world and nature...
filled with a regular pattern of gravitational waves.