Einstein's Tensor

Einstein's tensor, specifically the Einstein tensor, is a mathematical object used in the theory of General Relativity to describe the curvature of spacetime caused by mass and energy. Think of spacetime as a flexible fabric that bends when objects like planets and stars are present. The Einstein tensor captures how this fabric curves, which in turn determines how objects move and how gravity works. It combines information about the shape of spacetime and its changes, providing a precise way to connect matter-energy content to the geometry of the universe.