Abstract
We provide an explicit example of how the string winding modes can be incorporated in double field theory. Our guiding case is the closed bosonic string compactified on a circle of radius close to the self-dual point, where some modes with non-zero winding or discrete momentum number become massless and enhance the U(1) × U(1) symmetry to SU(2) × SU(2). We compute three-point string scattering amplitudes of massless and slightly massive states, and extract the corresponding effective low energy gauge field theory. The enhanced gauge symmetry at the self-dual point and the Higgs-like mechanism arising when changing the compactification radius are examined in detail. The extra massless fields associated to the enhancement are incorporated into a generalized frame with \( \frac{O\left(d+3,d+3\right)}{O\left(d+3\right)\times O\left(d+3\right)} \) structure, where d is the number of non-compact dimensions. We devise a consistent double field theory action that reproduces the low energy string effective action with enhanced gauge symmetry. The construction requires a truly non-geometric frame which explicitly depends on both the compact coordinate along the circle and its dual.
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Aldazabal, G., Graña, M., Iguri, S. et al. Enhanced gauge symmetry and winding modes in double field theory. J. High Energ. Phys. 2016, 93 (2016). https://doi.org/10.1007/JHEP03(2016)093
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DOI: https://doi.org/10.1007/JHEP03(2016)093