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A speculative form of computation that exploits the geometry of spacetime itself—using wormholes, time dilation, or quantum gravity effects to perform calculations beyond classical or even quantum limits. Spacetime computing might involve sending results back in time (closed timelike curves) to solve problems instantly, or using the curvature of spacetime to create exotic computational architectures. While firmly in the realm of thought experiments (and paradoxes), it touches on deep questions about computability, causality, and the nature of physical laws. It asks whether the universe’s structure could itself be harnessed as a computer.
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