A global anomaly from the Z-string

Details A global anomaly from the Z-string A global anomaly from the Z-string

1997-02-03

arxiv.org/abs/hep-th/9702023v7

Nucl.Phys. B495 (1997) 172-194

Physics

High Energy Physics

High Energy Physics - Theory

In Section 6 error corrected for SU(2) theories with general isospin; conclusions changed significantly

Scientific paper

10.1016/S0550-3213(97)00206-X

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.

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