Kasner metric

General relativity
${\displaystyle G_{\mu \nu }+\Lambda g_{\mu \nu }={\kappa }T_{\mu \nu }}$
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The Kasner metric (developed by and named for the American mathematician Edward Kasner in 1921)^[2] is an exact solution to Albert Einstein's theory of general relativity. It describes an anisotropic universe without matter (i.e., it is a vacuum solution). It can be written in any spacetime dimension ${\displaystyle D>3}$ and has strong connections with the study of gravitational chaos.