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If (in our mind) we reverse the velocity of every elementary particle in the Universe, does time reverse too? And if so does the same happen to the development of the all the wavefunctions and the expansion of space, both of which I find hard to believe?

Deschele Schilder
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On a classical scale, Newton's laws cannot tell you the direction of time. On a quantum scale, the notion of velocity is meaningless. So no.

I think the nearest answer you might get to quantum scale effects involving time and elementary particles is CPT Symmetry

And if so does the same happen to the development of the all the wavefunctions and the expansion of space, both of which I find hard to believe?

I am not sure what implications you mean to convey here, sorry :)