McVittie metric

The McVittie metric is a solution to the Einstein field equations in the context of general relativity that describes a specific type of spacetime geometry. It is named after the physicist William P. McVittie, who introduced it in the context of cosmology and gravitational theory. The McVittie metric represents a static, spherically symmetric gravitational field that can be considered as a black hole surrounded by a cosmological constant, which accounts for the effects of the expanding universe.