Kumar, AlokVafa, Cumrun2019-09-221997Kumar, Alok, and Cumrun Vafa. 1997. “U-Manifolds.” Physics Letters B 396 (1–4): 85–90. https://doi.org/10.1016/s0370-2693(97)00108-1.0370-26931873-2445http://nrs.harvard.edu/urn-3:HUL.InstRepos:41385004We use non-perturbative U-duality symmetries of type II strings to construct new vacuum solutions. In some ways this generalizes the F-theory vacuum constructions. We find the possibilities of new vacuum constructions are very limited. Among them we construct new theories with N = 2 supersymmetry in 3 dimensions and (1,1) supersymmetry in 2 dimensions.en-USJournal Article2019-09-2210.1016/S0370-2693(97)00108-1