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Physics
Special and General Relativity
How to rule out that the speed of light was different in the past?
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[QUOTE="Dale, post: 6847933, member: 43978"] The thing is that it isn’t a red herring. It is teaching an important principle: Asking about a change in a dimensionful universal constant is not meaningful. Only the dimensionless universal constants are physically meaningful. It just happens that the meaninglessness is most apparent with the speed of light and SI units. That is why the related physical question must be about the fine structure constant. [/QUOTE]
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Forums
Physics
Special and General Relativity
How to rule out that the speed of light was different in the past?
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