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This topic has appeared in the English Wikipedia rankings 1 time. It first appeared on 2026-05-11 and was most recently seen on 2026-05-11.
The harmonic coordinate condition is one of several coordinate conditions in general relativity, which make it possible to solve the Einstein field equations. A coordinate system is said to satisfy the harmonic coordinate condition if each of the coordinate functions satisfies d'Alembert's wave equation. The parallel notion of a harmonic coordinate system in Riemannian geometry is a coordinate system whose defining functions are harmonic, meaning they satisfy Laplace's equation. Since d'Alembert's equation is the generalization of Laplace's equation to spacetime, its solutions are also called harmonic.
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