But, it doesn't enable time travel. It just makes calculation easier, like «bending» of space-time array. If you switch from relativity to regular physics with

But, it doesn't enable time travel. It just makes calculation easier, like «bending» of space-time array. If you switch from relativity to regular physics with medium instead of pure vacuum (10 years passed since 2012 already, so relativity is busted at this point), then c is the speed of light in medium, so we don't need to bend anything or use negative t to calculate outcomes.