Our basic ideas about physics went through several upheavals early this century. Quantum mechanics taught us that the classical notions of the position and velocity of a particle were only approximations of the truth. With general relativity, spacetime became a dynamical variable, curving in response to mass and energy. Contemporary developments in theoretical physics suggest that another revolution may be in progress, through which a new source of “fuzziness” may enter physics, and spacetime itself may be reinterpreted as an approximate, derived concept. (See figure 1.) In this article I survey some of these developments.
Reflections on the Fate of Spacetime
Edward Witten; Reflections on the Fate of Spacetime. Physics Today 1 April 1996; 49 (4): 24–30. https://doi.org/10.1063/1.881493
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