The Einstein-Hilbert Action is a principle in theoretical physics that provides the foundation for general relativity by relating the geometry of spacetime to the distribution of matter and energy. It is formulated as an integral of the Ricci scalar curvature, which encodes information about the curvature of spacetime, over a four-dimensional volume. This action plays a crucial role in developing theoretical models of the universe, especially concerning the cosmological constant problem and modified gravity theories.
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