Faster-than-light communication
Why does FTL imply that BACKWARDS time travel is possible?
physics.stackexchange.com
Spacetime diagram (interctive)
demonstrations.wolfram.com
Why would FTL imply time travel
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Novikov self-consistency principle
en.wikipedia.org
How, in practice, could instantaneous signalling violate causality?
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What do spacelike, timelike and lightlike spacetime interval really mean?
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Krasnikov tube
en.wikipedia.org
Faster than light travel
www1.phys.vt.edu
Sharp Blue: Relativity, FTL and causality
theculture.org
Faster-than-light communication
math.ucr.edu
Visualisation: Minkowski diagrams
math.brown.edu
Paradoxes and FTL Communication
npl.washington.edu
Can you really go back in time by breaking the speed of light?
pbs.org
How does instantaneous communication violate causality?
askamathematician.com
Why FTL implies time travel
physicsmatt.com