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 Originally Posted by wufwugy
that makes me think of something else. a while back i read (from hawking i think) that if the universe started deflating instead of inflating, maybe things would be really funky like time moving backwards. what does this mean?
Sounds like nonsense to me.
It wouldn't mean anything on the QM level, and everything above that is just a statistical amalgamation of the underlying particles doing their thing.
Every process in QM is time symmetric. Meaning that if it happens one way, you could play the recording backwards and nothing would look odd. Every Feinman Diagram which shows an observed phenomenon in the universe can be read backwards along its time axis and it will still describe a phenomenon which is observed in the universe.
So my question is: How would we even notice if time was flowing backward? Would the Laws of Thermodynamics break down? Would Entropy be never increasing rather than its current state of never decreasing?
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