GHP formalism

GHP formalism, named after its developers, Gibbons, Hawking, and Perry, is a mathematical framework used in general relativity to study asymptotically flat spacetimes. It is particularly useful in the context of the asymptotic analysis of gravitational fields. The GHP formalism provides a systematic way to handle the complexities of the gravitational field's behavior at infinity and allows for a clearer understanding of various geometric and physical properties of spacetime.