Abstract
We study an \( \mathcal{N}=2 \) supersymmetric generalization of the three-dimensional critical O(N) vector model that is described by N + 1 chiral superfields with superpotential W = g 1 X∑ i Z 21 + g 2 X 3. By combining the tools of the conformal bootstrap with results obtained through supersymmetric localization, we argue that this model exhibits a symmetry enhancement at the infrared superconformal fixed point due to g 2 flowing to zero. This example is special in that the existence of an infrared fixed point with g 1 , g 2 ≠ 0, which does not exhibit symmetry enhancement, does not generally lead to any obvious unitarity violations or other inconsistencies. We do show, however, that the F-theorem excludes the models with g 1 , g 2 ≠ 0 for N > 5. The conformal bootstrap provides a stronger constraint and excludes such models for N > 2. We provide evidence that the g 2 = 0 models, which have the enhanced O(N) × U(1) symmetry, come close to saturating the bootstrap bounds. We extend our analysis to fractional dimensions where we can motivate the nonexistence of the g 1 , g 2 ≠ 0 models by studying them perturbatively in the 4 − ϵ expansion.
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Chester, S.M., Giombi, S., Iliesiu, L.V. et al. Accidental symmetries and the conformal bootstrap. J. High Energ. Phys. 2016, 110 (2016). https://doi.org/10.1007/JHEP01(2016)110
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DOI: https://doi.org/10.1007/JHEP01(2016)110