Abstract
We show that the representation of black-hole solutions in terms of the variables H M which are harmonic functions in the supersymmetric case is non-unique due to the existence of a local symmetry in the effective action. This symmetry is a continuous (and local) generalization of the discrete Freudenthal transformations initially introduced for the black-hole charges and can be used to rewrite the physical fields of a solution in terms of entirely different-looking functions.
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ArXiv ePrint: 1211.7296
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Galli, P., Meessen, P. & Ortín, T. The Freudenthal gauge symmetry of the black holes of = 2, d = 4 supergravity. J. High Energ. Phys. 2013, 11 (2013). https://doi.org/10.1007/JHEP05(2013)011
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DOI: https://doi.org/10.1007/JHEP05(2013)011