So my Cosmology prof (who does research in String Theory) mentioned something during class a few days ago that the driving factor behind Superconductivity is that the speed of light changes. Someone in my class spoke to him after the lecture about it and he rambled on about something to do with cooper-pairs requiring a change in the electromagnetic force law and this demands that the speed of light changes. I have never heard of this before, I have been to several rudimentary lectures on superconductivity and I have only ever come across Cooper Pairs and phonons being the driving force behind superconductivity. Does anyone have any idea what my prof was talking about and could shed some light on it? I have done a few google searches and have turned up empty-handed. Was he just mumbling some higher-dimension mumbo-jumbo or is his statement valid.