MG11 
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Monopole Decay in a Variable External Field

Rate of monopole decay into a dyon and an electron in an inhomogeneous external electric field is calculated by semiclassical methods. The monopole is considered within the 1-particle (quantum mechanical) approach, its Green's function is calculated in the leading exponential approximation, pre-exponential factors are discussed. Monopole decay is concluded to be enhanced by a temporally-inhomogeneous field and suppressed by a spatially inhomogeneous field. Despite being non-perturbatively suppressed, this process has been shown to take place under exotic conditions, e.g. in Reissner--Nordstrom black holes and in x-ray lasers. Non-stationarity of field in the latter case allows the action on the Euclidean closed worldline to become low and thus cease to suppress monopole decay. On the other hand, constant field approximation has been shown to be valid even for the most rapid processes in cosmology.