. . . . "Vacuum polarization around an Aharonov-Bohm solenoid"@en . . . "1991" . . . . . "Abstract. The quantisation of a charged scalar field in an externally specified electromagnetic field, described by the vector potentialAi=\u2202if withf(t,r,\u03B8,z)=B\u03B8 is discussed. The electromagnetic field is zero everywhere except at the origin; a singular magnetic field (Aharonov-Bohm field) exists at the origin. The vacuum polarization around such a magnetic field is computed and the non-local behaviour is discussed."@en . . "BF02846547" . . . . .