Lectures on nongeometric flux compactifications
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TL;DR: In this article, a pedagogical review of nongeometric flux compactifications is presented based on lectures given at the 2007 RTN Winter School at CERN, where the authors argue that one must include non-geometric 'fluxes' in order to have a superpotential which is invariant under T-duality.
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Abstract: These notes present a pedagogical review of nongeometric flux compactifications. We begin by reviewing well-known geometric flux compactifications in Type II string theory, and argue that one must include nongeometric 'fluxes' in order to have a superpotential which is invariant under T-duality. Additionally, we discuss some elementary aspects of the worldsheet description of nongeometric backgrounds. This review is based on lectures given at the 2007 RTN Winter School at CERN.
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