The Gibbons–Hawking ansatz is a concept in theoretical physics, particularly in the study of gravitational instantons, which are solutions to the classical equations of general relativity. Named after the physicists Gary Gibbons and Stephen Hawking, the ansatz constructs a specific form of metric that is useful for exploring the properties of four-dimensional manifolds, especially in the context of quantum gravity and the study of black hole thermodynamics.
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