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pines-demon
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- What means the group subindex in the notation of the Wu–Yang paper
In the 1975 Wu–Yang paper on electromagnetism=fiber bundle theory Table 1: https://journals.aps.org/prd/pdf/10.1103/PhysRevD.12.3845
Wu & Yang use the notation ##\mathrm{U}_1(1)## for the bundle of electromagnetism and ##\mathrm{SU}_2## for the isospin gauge field.
I am unfamiliar with this groups, unless we take the subindices, for example what the subindex 1 in ##\mathrm{U}_1(1)## means? Same for ##\mathrm{SU}_2## ?
Wu & Yang use the notation ##\mathrm{U}_1(1)## for the bundle of electromagnetism and ##\mathrm{SU}_2## for the isospin gauge field.
I am unfamiliar with this groups, unless we take the subindices, for example what the subindex 1 in ##\mathrm{U}_1(1)## means? Same for ##\mathrm{SU}_2## ?
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