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Is gravity just entropy rising? Long-shot idea gets another look
A new argument explores how the growth of disorder could cause massive objects to move toward one another. Physicists are both interested and skeptical.
It says gravity results from the same random jiggling and mixing up of particles — and the attendant rise of entropy, loosely defined as disorder — that governs steam boilers, car engines and refrigerators. Carney and coauthors Roshni Singh, Jacob Taylor, Thilo Scharnhorst and Manthos Karydas (clockwise from top left) recently developed concrete models showing how the rise of entropy could cause objects to appear to attract one another. “The real challenge in gravitational physics is understanding its strong-coupling, strong-field regime,” said Ramy Brustein, a theorist at Ben-Gurion University who said he used to be sympathetic to entropic gravity but has cooled on the idea.
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