I am trying to understand holonomy groups at the moment and am focusing on the example of the Hopf fibration $SU_2 \to S^2$. Since $S^2$ is path connected we can talk about the holonomy group of a connection for the fibration  ie it's the same at all points. For the usual monopole connection $\omega$, what is the holonomy group Hol$_p(\nabla)$ of $\omega$ at a point $p$. The holonomy bundle will of course be a principal Hol$_p(\nabla)$bundle over $S^2$, what is the total space of this bundle, how does Hol$_p(\nabla)$ act on it, what is the projection?

The monopole bundle is a nontrivial circle over the 2sphere with total space the 3sphere. The structure group of this bundle is $U(1)$, so there are not that many choices for the holonomy group: it's either $U(1)$ or else the connection is flat, in which case, since the 2sphere is simply connected, the holonomy group would be trivial. Now, the connection is not flat, so the holonomy is $U(1)$. 

