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Abstract
We consider QED - processes in the presence of an infinitely thin and infinitely long
straight string with a magnetic flux inside it. The bremsstrahlung from an electron
passing by the magnetic string and the electron-positron pair production by a single
photon are reviewed. Based on the exact electron and positron solutions of the Dirac
equation in the external Aharonov-Bohm potential we present matrix elements for these
processes. The dependence of the resulting cross sections on energies, directions
and polarizations of the involved particles is discussed for low energies.