The discussion revolves around the implications of a non-constant speed of light, particularly in the context of Einstein's theory of relativity. Participants explore the theoretical consequences if light were to behave differently in other galaxies or if faster-than-light particles were discovered.
Participants express differing views on the implications of a variable speed of light, with some suggesting it could invalidate existing theories, while others maintain that current evidence supports the constancy of light's speed. The discussion remains unresolved.
Participants acknowledge that their arguments depend on current observations and measurements, which have consistently indicated that the speed of light is a universal constant. There is an implied limitation in discussing hypothetical scenarios without empirical evidence.
You can never say 'never' but all measurements have led us to believe that c is a universal constant at this stage in the development of the Universe. There is a lot of evidence for this in the spectrum of light that we receive from millions of light years away. Exactly the same structure is observed in the spectrum of the light that's received and that strongly implies that the quantum mechanics at work out there is exactly the same as the QM we use here. If c were different, you would expect everything else to look very different and it doesn't.LogicobraElphfaVolf said: