TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhys.17.6.169
TI  - On a class of selection rules without group actions in field theory and string theory
PY  - 2024/12/19
UR  - https://scipost.org/SciPostPhys.17.6.169
JF  - SciPost Physics
JA  - SciPost Phys.
VL  - 17
IS  - 6
SP  - 169
A1  - Kaidi, Justin
AU  - Tachikawa, Yuji
AU  - Zhang, Hao Y.
AB  - 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 iv) eventually reduce to selection rules associated with an ordinary group symmetry. We start from basic field-theoretical examples in which fields are labeled by conjugacy classes rather than representations of a group, and discuss generalizations using fusion algebras or hypergroups. We also discuss how such selection rules arise naturally in string theory, such as for non-Abelian orbifolds or other cases with non-invertible worldsheet symmetries.
ER  -

@Article{10.21468/SciPostPhys.17.6.169,
	title={{On a class of selection rules without group actions in field theory and string theory}},
	author={Justin Kaidi and Yuji Tachikawa and Hao Y. Zhang},
	journal={SciPost Phys.},
	volume={17},
	pages={169},
	year={2024},
	publisher={SciPost},
	doi={10.21468/SciPostPhys.17.6.169},
	url={https://scipost.org/10.21468/SciPostPhys.17.6.169},
}