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>'One of the most fundamental philosophical questions is about the nature of time, precisely because all of our "laws" of physics are time reversible' Many of
by simonh 3y ago
>'One of the most fundamental philosophical questions is about the nature of time, precisely because all of our "laws" of physics are time reversible'
Many of our theories are, but the thing is we have several direct observations of time reversal symmetry violation (below), independent of the experimental demonstrations of CP violation which also imply T-Symmetry violation.
https://arxiv.org/abs/1409.5998 https://arxiv.org/abs/1409.5998
https://pubs.aip.org/physicstoday/article-abstract/52/2/19/410762/Two-Experiments-Observe-Explicit-Violation-of-Time?redirectedFrom=fulltext https://pubs.aip.org/physicstoday/article-abstract/52/2/19/4...
- MengerSponge 3y agoYes! This is important. It's a finding from 1964, nearly 60 years ago, and it is included in the Standard Model of physics. One interesting thing is that unlike the other discrete symmetries, we haven't found a system that has a large Time-reversal symmetry violation. Not having a large enough source of T-violation is actually one of the major problems with the SM! Related supplemental reading on the Strong CP problem: https://www.forbes.com/sites/startswithabang/2019/11/19/the-strong-cp-problem-is-the-most-underrated-puzzle-in-all-of-physics/?sh=313919bd1ea7 https://www.forbes.com/sites/startswithabang/2019/11/19/the-...