Question

Could time consistently flow in reverse?

Answer 1

I am failing to detect the grand idea in the paper. Starting out with a path integral should recover a Schroedinger-like equation... check, but irrelevant. A path integral is basically the integral form of a partial differential equation... the choice of which paths one integrates over might be mathematically equivalent to a violation of time reversal, but it's physically irrelevant unless an actual physical mechanism for that choice is given, which I don't see. A lot of people have, IMHO, made similar observations to hers, but nothing seems to gel into acting so far

Interestingly she does cite an observation in 2012, published in Phys Rev Lett of a time reversal violation in a B0 meson system; quite what this means I'm not sure. 

@CuriousOne - so, if she established a correlation between a possible physical mechanism for her path integral, would that convince you of such a possibility (i.e. time reversal might be possible)? 

Answer 2

Explanation:

In theory, all physical processes can run forward and backward; it's just that in classical physics, the second law of thermodynamics puts a stop to things like time going backward and toast un-burning. But that red light doesn't apply to quantum mechanics.