'Alternative physics' discovered by artificial intelligence

A study on the physics discovery titled "Automated discovery of fundamental variables hidden in experimental data" has been published in the journal Nature Computational Science. Researchers from Columbia Engineering have developed a new artificial intelligence (AI) program that could derive the fundamental variables of physics from video footage of physical phenomena. The program analyzed videos of systems like the swinging double pendulum, which researchers already know four "state variables" exist for; the angle and angular velocity of each arm. Within a few hours, the AI determined there were 4.7 variables at play. "We thought this answer was close enough. Especially since all the AI had access to was raw video footage, without any knowledge of physics or geometry. But we wanted to know what the variables actually were, not just their number," said Hod Lipson, director of the Creative Machines Lab in the Department of Mechanical Engineering.