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In six-dimensional supergravity, there is a natural sense in which matterlying in certain representations of the gauge group is "generic," in the sensethat other "exotic" matter representations require more fine tuning. Fromconsiderations of the dimensionality of the moduli space and anomalycancellation conditions, we find that the generic sets of matterrepresentations are well-defined for 6D supergravity theories with gauge groupscontaining arbitrary numbers of nonabelian factors and $\operatorname{U}(1)$factors. These generic matter representations also match with those that arisein the most generic F-theory constructions, both in 6D and in 4D, withnon-generic matter representations requiring more exotic singularity types. Theanalysis of generic versus exotic matter illuminates long-standing puzzlesregarding F-theory models with multiple $\operatorname{U}(1)$ factors andprovides a useful framework for analyzing the 6D "swampland" of apparentlyconsistent low-energy theories that cannot be realized through known stringconstructions. We note also that the matter content of the standard model isgeneric by the criteria used here only if the global structure is$\operatorname{SU}(3)_\text{c} \times \operatorname{SU}(2)_\text{L} \times\operatorname{U}(1)_Y / \mathbb{Z}_6$.

Generic matter representations in 6D supergravity theories