Non-Supersymmetric Open String Vacua
Abstract
Description
We review the construction of non-supersymmetric open string vacua in various dimensions. They can be obtained either projecting the (compactified) non-supersymmetric 0B theory, or applying the Scherk-Schwarz mechanism to open strings. Generically, these vacua generate a non-vanishing cosmological constant. However, one can construct particular kinds of Scherk-Schwarz compactifications with vanishing cosmological constant, at least for low orders, based on asymmetric orbifolds. A generic feature of these models is that supersymmetry remains unbroken on the branes at all mass level, while it is broken in the bulk in a way that preserves Fermi-Bose degeneracy at each mass level in the perturbative string spectrum.
8 pages, Latex + JHEP.cls. Contribution to the Proceedings of the Trieste Meeting of the TMR Network on Physics beyond the SM
8 pages, Latex + JHEP.cls. Contribution to the Proceedings of the Trieste Meeting of the TMR Network on Physics beyond the SM