The Equivalence Principle is a fundamental concept in physics, particularly in the context of general relativity. It states that the effects of gravity are locally indistinguishable from those of acceleration. In other words, being in a gravitational field and being in an accelerating reference frame are equivalent in terms of the physical effects experienced by an observer.
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The equivalence principle states that gravity couples universally to energy-momentum and that a freely falling local frame removes uniform gravitational acceleration at a point. Tidal curvature remains measurable over a finite region.