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Has been pointed out to us [M.P.A. Fisher (private communication)] that in the presence of unbound, singly quantized vortices this gauge transformation is singular, and therefore multivalued. One can in principle remedy this difficulty by defining branch cuts in the two-dimensional plane which terminate on the vortices; however, in practice it is unclear how one would incorporate this cut structure into a perturbative many-body calculation, such as the one which we develop in this work. We leave this as an unresolved issue which deserves further study.
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In has been pointed out to us [M.P.A. Fisher (private communication)] that in the presence of unbound, singly quantized vortices this gauge transformation is singular, and therefore multivalued. One can in principle remedy this difficulty by defining branch cuts in the two-dimensional plane which terminate on the vortices; however, in practice it is unclear how one would incorporate this cut structure into a perturbative many-body calculation, such as the one which we develop in this work. We leave this as an unresolved issue which deserves further study.
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