A global anomaly from the Z-string
Abstract
The response of isodoublet fermions to classical backgrounds of essentially 2-dimensional boson fields in SU(2) Yang-Mills-Higgs theory is investigated. In particular, the spectral flow of Dirac eigenvalues is calculated for a non-contractible sphere of configurations passing through the vacuum and the Z-string (the embedded vortex solution). Also, a non-vanishing Berry phase is established for adiabatic transport "around" the Z-string. These results imply the existence of a new type of global (non-perturbative) gauge anomaly in SU(2) Yang-Mills-Higgs quantum field theory with a single doublet of left-handed fermions. Possible extensions to other chiral gauge field theories are also discussed.
Cite
@article{arxiv.hep-th/9702023,
title = {A global anomaly from the Z-string},
author = {F. R. Klinkhamer and C. Rupp},
journal= {arXiv preprint arXiv:hep-th/9702023},
year = {2009}
}
Comments
In Section 6 error corrected for SU(2) theories with general isospin; conclusions changed significantly