Saturday 18 July 2020

quantum field theory - Can path integral paths go backwards in time?


The paths can cross any coordinate at any time in the whole space (e.g. Universe space). Integration goes over all could-you-imagine paths. But time goes strictly forward. Can time variable resemble coordinate variable and path be able to expect backward turn?


Upd 2014-01-04: yes, it's called spacetime, but the time coordinate is still very special.




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