Einstein–Hilbert action
The Einstein–Hilbert action (also referred to as Hilbert action) in general relativity is the action that yields the Einstein field equations through the stationary-action principle. With the (− + + +
Variational methods in general relativity
Variational methods in general relativity refers to various mathematical techniques that employ the use of variational calculus in Einstein's theory of general relativity. The most commonly used tools
Plebanski action
General relativity and supergravity in all dimensions meet each other at a common assumption: Any configuration space can be coordinatized by gauge fields , where the index is a Lie algebra index and
Gibbons–Hawking–York boundary term
In general relativity, the Gibbons–Hawking–York boundary term is a term that needs to be added to the Einstein–Hilbert action when the underlying spacetime manifold has a boundary. The Einstein–Hilber