This article needs attention from an expert in Physics. The specific problem is: article is more opinionated than encyclopedic; citations and other revisions needed to make it a standard treatment of a standard topic.(April 2021) |
General relativity |
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In general relativity, an exact solution is a solution of the Einstein field equations whose derivation does not invoke simplifying assumptions, though the starting point for that derivation may be an idealized case like a perfectly spherical shape of matter. Mathematically, finding an exact solution means finding a Lorentzian manifold equipped with tensor fields modeling states of ordinary matter, such as a fluid, or classical non-gravitational fields such as the electromagnetic field.