3 ms·
It's not quite measurable; the magnetic potential is gauge invariant, which means, among a great deal many other things, that it has no well-defined measurable
by Elpis1 4y ago
It's not quite measurable; the magnetic potential is gauge invariant, which means, among a great deal many other things, that it has no well-defined measurable value. However, it is certainly physical; things like the Aharonov–Bohm effect prove that.
- wnoise 4y agoYou're missing a "not".
- Elpis1 4y agoWhere?
- wnoise 4y agoin "the magnetic potential is gauge invariant". It differs for different gauges, so is not gauge-invariant, but gauge-dependent. A choice of A _is_ a choice of gauge. The theory using it (i.e. E&M Lagrangian) is what is gauge-invariant. This is a hyper-correction; in practice physicists apply the term in places adjacent to where it should be all the time.
- Elpis1 4y agoAh, sorry about that! You're right, of course; my brain slipped a bit.
- deleted 4y ago[deleted]