The Einstein-Hilbert Action is a fundamental principle in the framework of general relativity that describes how the geometry of spacetime interacts with matter and energy. This action is given by the integral of the Ricci scalar curvature over the spacetime manifold, which captures the gravitational dynamics and leads to the Einstein field equations when applied through the principle of least action. By connecting geometry and physics, this action plays a pivotal role in our understanding of gravity as a geometric property of spacetime rather than a force acting at a distance.
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