Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2002-10-22
JHEP 0309:054,2003
Physics
High Energy Physics
High Energy Physics - Theory
30 pages, harvmac, references and brief comments on gauged supergravity added
Scientific paper
10.1088/1126-6708/2003/09/054
We investigate compactifications with duality twists and their relation to orbifolds and compactifications with fluxes. Inequivalent compactifications are classified by conjugacy classes of the U-duality group and result in gauged supergravities in lower dimensions with nontrivial Scherk-Schwarz potentials on the moduli space. For certain twists, this mechanism is equivalent to introducing internal fluxes but is more general and can be used to stabilize some of the moduli. We show that the potential has stable minima with zero energy precisely at the fixed points of the twist group. In string theory, when the twist belongs to the T-duality group, the theory at the minimum has an exact CFT description as an orbifold. We also discuss more general twists by nonperturbative U-duality transformations.
Dabholkar Atish
Hull Chris
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