Abstract
We use solution-generating techniques to construct interpolating geometries
between general asymptotically flat, charged, rotating, non-extremal black
holes in four and five dimensions and their subtracted geometries. In the
four-dimensional case, this is achieved by the use of Harrison transformations,
whereas in the five-dimensional case we use STU transformations. We also give
the interpretation of these solution-generating transformations in terms of
string (pseudo)-dualities, showing that they correspond to combinations of
T-dualities and Melvin twists. Upon uplift to one dimension higher, these
dualities allow us to üntwist" general black holes to AdS\_3 times a sphere.
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