@Pat idk much about this shit, but people smarter than me have postulated that the so-called speed of light may be better termed the speed of causality, because it better describes what the c in e=mc^2 actually represents.
Though I suppose my interpretation of "causality" in this sense may be off.
Though I suppose my interpretation of "causality" in this sense may be off.
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Also referred to as the speed of information, forming a "light cone".
Although Einstein found mass-energy equivalence via special relativity (which implies causality), I don't think mass-energy equivalence itself excludes the possibility of a non-causal extent. Einstein developed special relativity at the macro level, even though it is applied in quantum mechanics, e.g. in quantum field theory (which, I believe also requires causality).
