This group gathers theorems of relativity and gravitational theory, the mathematics of spacetime, black holes and cosmology. It covers uniqueness results for gravitational solutions, singularity theorems, bounds on the density of stars, and results about the expansion of the universe. A theorem belongs here when its cited article places it in general relativity, black hole physics, gravitational lensing or cosmology. Results about mechanics without relativistic effects are grouped under classical mechanics instead.
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Relativity and Gravitation
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Birkhoff's theorem (relativity) (Wikipedia)
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In general relativity, Birkhoff-Jebsen's theorem states that any spherically
Penrose-Hawking singularity theorems (Wikipedia)
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Roger Penrose and Stephen Hawking) are a set of results in general relativity that attempt to answer the question of when gravitation
No-hair theorem (Wikipedia)
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equations of gravitation and electromagnetism in general relativity can be completely characterized by only three
Buchdahl's theorem, Wikipedia
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In general relativity, Buchdahl's theorem, named after Hans Adolf Buchdahl
Borde-Guth-Vilenkin theorem, Wikipedia
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The Borde-Guth-Vilenkin (BGV) theorem is a theorem in physical cosmology which deduces that any universe that has, on
Odd number theorem - Wikipedia
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theorem is a theorem in differential topology about strong gravitational lensing, which states that the number of multiple images
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