“…We show that a realization of these algebras occurs in M-theory compactifications on twisted tori with constant four-form flux, due to the presence of antisymmetric tensor fields in the reduced theory.…”
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“…Using the equivalence between Scherk-Schwarz reductions and twisted tori compactifications, we discuss the effective theories obtained by this procedure from M-theory and N =4 type II orientifold constructions with Neveu-Schwarz and Ramond-Ramond form fluxes turned on. …”
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“…We will report on recent advances in the understanding of non-perturbative interconnections between different string dualities.Weak-strong coupling duality (S-duality) and T-duality (symmetry under compactification on dual tori) allows one to compare and explore the strong coupling regime of seemingly unrelated theories. …”
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“…These theories are related to D=11, M, M/sup */ and M' theories or D=10, IIB, IIB/sup */ theories when compactified on Lorentzian tori. All dimensionally reduced theories fall in three distinct phases specified by the number of (128 bosonic) positive and negative norm states: (n/sup +/, n/sup -/)=(128,0), (64,64), (72,56). (35 refs).…”
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