Flavor symmetries and automatic enhancement in the 6D supergravity swamplandCvetič, Mirjam (Avtor) Lin, Ling (Avtor) Turner, Andrew P. (Avtor) supergravity theoriessupersymmetric stringsquantum gravity constraintsGauge theoriesHigher-dimensional field theoriesstrings & branessupergravitysymmetriesWe argue for the quantum-gravitational inconsistency of certain 6D N ¼ ð1; 0Þ supergravity theories, whose anomaly-free gauge algebra g and hypermultiplet spectrum M were observed by Raghuram et al. [J. High Energy Phys. 07 (2021) 048] to be realizable only as part of a larger gauge sector ðg0 ⊃ g; M0 ⊃ MÞ in F-theory. To detach any reference to a string theoretic method of construction, we utilize flavor symmetries to provide compelling reasons why the vast majority of such ðg; MÞ theories are not compatible with quantum gravity constraints, and how the “automatic enhancement” to ðg0 ; M0 Þ remedies this. In the first class of models, with g0 ¼ g ⊕ h, we show that there exists an unbroken flavor symmetry h acting on the matter M, which, if ungauged, would violate the no-global-symmetries hypothesis. This argument also applies to 1-form center symmetries, which govern the gauge group topology and massive states in representations different from those of massless states. In a second class, we find that g is incompatible with the flavor symmetry of certain supersymmetric strings that must exist by the completeness hypothesis.APS20222023-09-25 09:54:39Znanstveno delo85991UDK: 530.145COBISS_ID: 136975875DOI: 10.1103/PhysRevD.105.046005ISSN pri članku: 2470-0029sl