Mariana Graña, Ruben Minasian, Hagen Triendl, Thomas Van Riet
We observe that the standard consistent truncation procedure for group manifold reductions can lead to false predictions concerning the amount of supersymmetry preserved by a (vacuum) solution and the number of massless excitations. This problem affects notably the so-called flat group reductions, introduced originally by Scherk and Schwarz. When applied to compactifications of maximal supergravity, the standard truncation procedure gives a lower-dimensional maximal gauged supergravity with a Minkowski vacuum that completely breaks supersymmetry and in which part of the moduli are lifted. We point out that instead the vacuum of ten-dimensional supergravity preserves all supercharges and the massless excitations are described by ungauged maximal supergravity in four dimensions.
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http://arxiv.org/abs/1305.0785
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