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Lambdavacuum solution - Wikipedia

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In general relativity, a lambdavacuum solution is an exact solution to the Einstein field equation in which the only term in the stress–energy tensor is a cosmological constant term. This can be interpreted physically as a kind of classical approximation to a nonzero vacuum energy. These are discussed here as distinct from the vacuum solutions in which the cosmological constant is vanishing. Terminological note: this article concerns a standard concept, but there is apparently no standard term to denote this concept, so we have attempted to supply one for the benefit of Wikipedia. The Einstein field equation is often written as 𝐺 𝑎 𝑏 + Λ 𝑔 𝑎 𝑏 = 𝜅 𝑇 𝑎 𝑏 , with a so-called cosmological constant term Λ 𝑔 𝑎 𝑏 . However, it is possible to move this term to the right hand side and absorb it into the stress–energy tensor 𝑇 𝑎 𝑏 , so that the cosmological constant term becomes just another contribution to the stress–energy tensor. When other contributions to that tensor vanis

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