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Witten's SU(2) anomaly on the lattice
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hep-lathep-th
keywords
anomalylatticeoverlapwittenanalyticityberrydefineddimension
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abstract
Witten's anomaly for SU(2) with a single I=1/2 Weyl fermion in four dimension is shown to be reproduced by the lattice overlap. The mechanism is based on Berry's phase, and on the analyticity of the matrix $H$ by which the overlap is defined.
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