The paper claims that with the correct multi-valued boundary conditions, the differential cross-section for charged particles scattering off an Aharonov-Bohm cosmic string is zero, eliminating the proposed baryogenesis enhancement.
Since Sq(Σ) = V 2πq N (Σ; σ )e− 2πiq N ∫ σ ∗jΨ , it is clear that Sq both shifts the gauge field and causes Ψ( x) to be multi-valued
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Revisiting Scattering Enhancement from the Aharonov-Bohm Effect
The paper claims that with the correct multi-valued boundary conditions, the differential cross-section for charged particles scattering off an Aharonov-Bohm cosmic string is zero, eliminating the proposed baryogenesis enhancement.