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time reversal
The mathematical operation analogous to running a movie film backward, i.e. replacing time t with time -t. In other words, a transformation from agiven physical system undergoing a given sequence of events to a system in which the exact reverse sequence of states is undergone. The symmetry of time reversal (symbol T) is known as T invariance. As with CP violation, T violation occurs in certain weak interactions, notably kaon decay. See also CPT theorem.
Related category
• PARTICLE PHYSICS
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