Gravity

Italian underground lab searches for quantum gravity signals

Italian underground lab searches for quantum gravity signals

The low-radioactivity underground laboratory of the Gran Sasso. Credit: Massimiliano De Deo, LNGS-INFN For decades, physicists have been searching for a model of quantum gravity that would unify quantum physics, the laws that govern the infinitely small, and gravity. A major obstacle has been the difficulty of experimentally testing the predictions of the candidate models. …

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Physicists are rewriting a quantum rule that conflicts with our universe

Physicists are rewriting a quantum rule that conflicts with our universe

“There are certain configurations of the future that don’t match anything from the past,” Cotler said. “There is nothing in the past that could evolve in them.” Giddings proposed a similar principle for ruling out the paradoxical states he encountered while studying black holes last year. He calls it “history matters”, and he argues that …

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