Willem de Sitter (1872-1934) derives an isotropic static cosmology with a cosmological constant as well as an empty expanding cosmology with a cosmological constant. They represent a solution for Einstein’s general relativity in which there is no matter and a positive cosmological constant. This results in an exponentially expanding, empty universe.
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Citation: Editors, Litencyc. "The concepts of the de Sitter space and de Sitter universe proposed". The Literary Encyclopedia. First published 01 May 2009 [https://www.litencyc.com/php/stopics.php?rec=true&UID=6449, accessed 06 May 2024.]
