Faster-than-light communication

Faster-than-light communication, also called superluminal communication, is a hypothetical process in which <a href="/facts/Information/3LdrzXtJ">information</a> is conveyed at <a href="/facts/Faster-than-light/tpFg6JNd">faster-than-light</a> speeds. The current scientific consensus is that faster-than-light communication is not possible, and to date it has not been achieved in any experiment.
Faster-than-light communication other than possibly through <a href="/facts/Wormhole/VtlJwany">wormholes</a> is likely impossible because, in a <a href="/facts/Lorentz_covariance/K5AEuGKg">Lorentz-invariant</a> theory, it could be used to <a href="/facts/Tachyonic_antitelephone/NwQhYFmm">transmit information into the past</a>. This would complicate <a href="/facts/Causality_(physics)/bkoXXhU3">causality</a>, but no theoretical arguments conclusively preclude this possibility.
A number of theories and phenomena related to faster-than-light communication have been proposed or studied, including <a href="/facts/Tachyon/bqvlsfTa">tachyons</a>, <a href="/facts/Neutrino/yGWVfSg2">neutrinos</a>, <a href="/facts/Quantum_nonlocality/GUA6LlI5">quantum nonlocality</a>, <a href="/facts/Wormhole/VtlJwany">wormholes</a>, and <a href="/facts/Quantum_tunneling/WU4NMrKx">quantum tunneling</a>.

Faster-than-light communication open-in-new

Faster-than-light communication