Local gauge invariance of free fields [PDF]
Bernd A. BergIt is noted that, in contrast to widespread believes, free fields do not only allow for global, but also for local gauge invariance. In a Markov chain Monte Carlo calculation for complex free Bose fields it is seen that including local gauge transformations in the updates changes the dynamics of the calculation while the estimates of physical quantities stay invariant.View original: http://arxiv.org/abs/1206.1303
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