The Vaidya metric is a solution to the Einstein field equations in general relativity that describes the spacetime geometry around a radiating body. It is particularly useful for modeling scenarios where a star or another massive object is losing mass due to radiation, which can occur during supernovae, for example. The Vaidya solution is an extension of the Schwarzschild solution, which describes the gravitational field outside a non-radiating, spherically symmetric massive body.
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