Time in the Universe is experienced exclusively in one direction, forward. Everyday occurrences demonstrate that physical processes do not reverse. However, laws governing the Universe, from classical mechanics to quantum physics, exhibit time-reversal invariance. This symmetry shows that the physical laws remain unchanged regardless of the direction of time. Despite strong intuitive beliefs suggesting these laws should violate this invariance, up until recent advancements, no such violations were observed. A breakthrough in 2012 confirmed that physics does differ based on the direction of time, providing evidence that challenges the established perception.
Our everyday experiences suggest that the laws of physics must violate time-reversal invariance, yet every observed interaction appears to obey this symmetry.
In 2012, physicists succeeded in experimentally demonstrating that the laws of physics exhibit differences based on the direction of time.
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