Can Time Travel Really Avoid Violating Causality?

[byron178]

Are you pulling my leg? I said a few times you don't necessarily have to consider them "real" at all...

No i was being serious,i was reading that virtual particles in fact travel faster than light and backwards in time but don't violate causality,but i can't seem to wrap my head around this one.

 

[JesseM]

No i was being serious,i was reading that virtual particles in fact travel faster than light and backwards in time but don't violate causality,but i can't seem to wrap my head around this one.

If you don't consider them real, but just a mathematical tool for making calculations about observable effects, why is this a problem? No actual measured effects go FTL or backwards in time.