The Causal Bottleneck: A Unified Classification of FTL No-Go Results

The question in focus

Organizes proposed faster-than-light mechanisms around controllability, covariance and effective speed, linking quantum-information and relativistic causal restrictions.

Scope & open questions

• Does not establish a new general impossibility theorem.
• Reports no experimental transport result. Remaining preferred-frame and topology-change questions are unresolved; a surveyed topology-change transition is unmeasured.

Source & version notes

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Summary based on the current manuscript. Read the full text for definitions, derivations, references, and the author’s complete argument.

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