Faster-than-light communication
Why does FTL imply that BACKWARDS time travel is possible?
Spacetime diagram (interctive)
Why would FTL imply time travel
Novikov self-consistency principle
How, in practice, could instantaneous signalling violate causality?
What do spacelike, timelike and lightlike spacetime interval really mean?
Krasnikov tube
Faster than light travel
Sharp Blue: Relativity, FTL and causality
Faster-than-light communication
Visualisation: Minkowski diagrams
Paradoxes and FTL Communication
Can you really go back in time by breaking the speed of light?
How does instantaneous communication violate causality?
Why FTL implies time travel