Abstract
We analyze the anomaly constraints on 6D supergravity theories with a single abelian U(1) gauge factor. For theories with charges restricted to q = ±1, ±2 and no tensor multiplets, anomaly-free models match those models that can be realized from F-theory compactifications almost perfectly. For theories with tensor multiplets or with larger charges, the F-theory constraints are less well understood. We show, however, that there is an infinite class of distinct massless charge spectra in the “swampland” of theories that satisfy all known quantum consistency conditions but do not admit a realization through F-theory or any other known approach to string compactification. We also compare the spectra of charged matter in abelian theories with those that can be realized from breaking nonabelian SU(2) and higher rank gauge symmetries.
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Taylor, W., Turner, A.P. An infinite swampland of U(1) charge spectra in 6D supergravity theories. J. High Energ. Phys. 2018, 10 (2018). https://doi.org/10.1007/JHEP06(2018)010
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DOI: https://doi.org/10.1007/JHEP06(2018)010