Theory about magnetic monopoles?

[jostpuur]

I've heard some random arguments about magnetic monopoles, and don't know what I should think about them yet. I can see that such electromagnetic field could not be described by the usual potential $$A^\mu$$. Is there some modified potential that allows magnetic monopoles? Is there a lagrangian density from which a modified Maxwell's equations could be derived?

 

[Repetit]

You should try to take a look at this article:

"Theory of Magnetic Monopoles and Electric-Magnetic Duality"

Just do a google search for that title.