Summary
Pure quantized Yang-Mills theories are constructed by causalperturbation theory. We study operator gauge transformations which lead in a natural way to the introduction of ghost fields. Considering fermionic as well as bosonic ghosts, we find that only the former save gauge invariance in second order. We work with free quantum fields throughout, so that all expressions are mathematically well defined.
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Work supported by Schweizerischer Nationalfonds.
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Dütsch, M., Hurth, T., Krahe, F. et al. Causal construction of Yang-Mills theories. Nuov Cim A 106, 1029–1041 (1993). https://doi.org/10.1007/BF02773492
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DOI: https://doi.org/10.1007/BF02773492