De Sitter space

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Science and technology

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What Wikipedia says

In mathematical physics, n-dimensional de Sitter space (often denoted dSn) is a maximally symmetric Lorentzian manifold with constant positive scalar curvature. It is analogue of an n-sphere, with a Lorentzian metric in place of the Riemannian metric of the latter.

Excerpt from the Wikipedia article “De Sitter space”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: User:Anarkman, Public domain, via Wikimedia Commons.