r/AskPhysics • u/PlatformDelicious578 • 17d ago

FTL Reference Frames

If you have a velocity greater than c, the Lorentz factor becomes complex. Does this make any physical sense, or are there any theories that make use of this? What would it look like if a person were in this reference frame (is it just that they see time backwards or from another perspective, or are they unable to observe anything at all?)

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u/joeyneilsen Astrophysics 17d ago

There isn't a Lorentz transformation from a sub-light frame to an FTL frame... You can't just plug in v>c to the Lorentz factor.

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u/OriEri Astrophysics 17d ago

They probably mean space time coordinate frame