Magnetic Monopoles: Size, Quantization, and Existence in Space

[Rothiemurchus]

What is the size of the smallest magnetic charge a magnetic monopole can have? And why are magnetic charges quantized inversely to electric charges?
Also,can two oppositely charged magnetic monopoles exist as dipoles like for example + -.And what wavelength of radiation would such a dipole absorb?
How do monopoles cancel out the galactic magnetic field (if monopoles existed in large numbers,apparently,this would happen.A magnetic dipole of the type I have mentioned would not cancel out a magnetic field,would it)?
And why is it generally considered that there would be monopoles in space and not dipoles (electric charges tend to stay togther)?

 

[marlon]

Magnetic monopoles are looked at as being point particles in QFT. Like i stated before, for example in the dual abelian Higgsmodell, they are used in order to describe the dual analogon of the Meissner-effect that pushes the magnetic field lines out of a superconductive specimen...The actual charge of such a monopole is determined in those points of the space-time where the gauge of the field theory is undetermined. This means, where this gauge becomes singular...

regards
marlon

 

[marlon]

I attached a document i which i answer to your question of quantization of magnetic charge. The reason for this phenomenon is the Dirac-quantization which makes sure that the Dirac string is not noticable when you pass through a surface that is subtended by a deformed world-line

regards
marlon