Gödel metric

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What Wikipedia says

The Gödel metric, also known as the Gödel solution or Gödel universe, is an exact solution, found in 1949 by Kurt Gödel, of the Einstein field equations in which the stress–energy tensor contains two terms: the first representing the matter density of a homogeneous distribution of swirling dust particles (see Dust solution), and the second associated with a negative cosmological constant (see Lambdavacuum solution).

Excerpt from the Wikipedia article “Gödel metric”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: The original uploader was Hillman at English Wikipedia., CC BY-SA 1.0, via Wikimedia Commons.