Abstract
Like monopoles, cosmic strings can catalyze proton decay. The cross section for this process is given by the geometrical cross section. Unlike in the case of monopole-catalyzed proton decay, there is no amplification of the fermion wave function near the core of the defect and hence there is no amplification of the cross section. The scattering cross section of bosons off of cosmic strings is larger than the geometrical cross section, as a consequence of the statistics.
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