Kavli Affiliate: Yuji Tachikawa | First 5 Authors: Justin Kaidi, Yuji Tachikawa, Hao Y. Zhang, , | Summary: We discuss a class of selection rules which i) do not come from group actions on fields, ii) are exact at tree level in perturbation theory, iii) are increasingly violated as the loop order is raised, and […]
Continue.. On a class of selection rules without group actions in field theory and string theory