Einstein’s Theory of Relativity

Special and General Relativity

The theory of relativity consists of Albert Einstein’s two interrelated theories: special relativity, published in 1905, and general relativity, developed between 1907 and 1915. Special relativity describes the structure of spacetime in the absence of gravity and replaces the Galilean transformations of classical mechanics with Lorentz transformations. It is based on the relativity principle and the constancy of the speed of light, leading to consequences such as the relativity of simultaneity, time dilation, length contraction, a finite universal speed limit, and mass–energy equivalence expressed as E = mc². General relativity explains gravity as the curvature of four-dimensional spacetime caused by mass, energy, and momentum. Based on the equivalence principle and expressed through Einstein’s field equations, it predicts gravitational time dilation, the precession of orbits, the bending of light, frame-dragging, black holes, gravitational waves, and the expansion of the universe. Both theories have been supported by extensive experimental evidence, including the Michelson–Morley, Kennedy–Thorndike, and Ives–Stilwell experiments, observations of Mercury’s orbit and gravitational light deflection, and modern applications such as GPS, precision timekeeping, particle accelerators, and electron microscopes.

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Historical Development and Acceptance

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