Is the Following How Most Students Think of Einstein's View Of QM

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  • Thread starter bhobba
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It is terminology sometimes found in foundational discussions of SR. Strictly speaking SR does not forbid speeds FTL - just the ability to sync clocks by signals FTL ie signals carrying information.
What does this mean? How could SR forbid the ability to sync clocks by signals FTL?

Also, AFAIK aether theories or other preferred frame theories give the same predictions as SR, and are consistent with a restricted form of FTL communication, that is, we can allow FTL communication in a preferred frame, still no causal loop or causality paradox could occur.
 
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What does this mean? How could SR forbid the ability to sync clocks by signals FTL?
Please, as I mentioned, take this up on the relativity forum.

But just as an overview, SR says the fastest information can be sent is the speed of light. The reason is the c that appears in the equations must the unique speed the same in all frames. Let s be the fastest speed information can be sent - it could be infinity. Now to sync clocks by signals you can't do that with signals faster than s. But by the Principle Of Relativity that must be the same in all frames. However only one speed is the same in all frames - that is the c in the SR equations ie s=c. Now if you can't send information, then you can't use it to sync clocks - or anything really - so the argument breaks down.

Thanks
Bill
 
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