Mainstream theories in cosmology assume that parameters like the speed of light $c$, and the gravitational constant $G$ are time-independent. Is there any evidence suggesting that this assumption is reasonable, and what would the implications be if $c$ or $G$ were time-dependent?
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1Possible duplicates: http://physics.stackexchange.com/q/21721/2451 , http://physics.stackexchange.com/q/144262/2451 , and links therein. – Qmechanic Nov 23 '14 at 20:49
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Its not a duplicate. That question asks whether parameters can be location-dependant. – math_lover Nov 23 '14 at 20:56
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1@JoshuaBenabou . . . or time-dependent. – HDE 226868 Nov 23 '14 at 21:12