you can only move forward in time, not backwards.
this is applied to particles already. in huge accelerator tunnels, a particle with lets say only 1ms of a lifespan is brought to close to the lightspeed (it is impossible to reach it), and for example for the outside observer, its life expands to 1 minute.. so the particle went forward 1 minute in time within 1ms only.. thats an example of time travel.
nothing can go faster than lightspeed.. but teleportation is theoretically possible.. they even teleported a photon in an experiment.. but this doesnt have to do with time travel i believe.. you can just take a "shortcut" and get to a place quicker than a lightbeem, but it doesnt mean you have traveled faster than lightspeed or did a time travel, its a different concept.
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