Prequantization of the Moduli Space of Flat ${\rm PU}(p)$-Bundles with   Prescribed Boundary Holonomies
  Using the framework of quasi-Hamiltonian actions, we compute the obstruction to prequantization for the moduli space of flat ${\rm PU}(p)$-bundles over a compact orientable surface with prescribed holonomies around boundary components, where $p>2$ is prime. 
Derek Krepski
math.SG