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Non-extreme black holes of five-dimensional \(N=2\) AdS supergravity. (English) Zbl 0949.83072
Summary: We consider static black holes of \(D=5\), \(N=2\) gauged supergravity with general spatial curvature \(k\) and show that the modifications due to the gauging as well as \(k\) enter only the non-extremality function. Therefore, one can promote any (known) black hole solution of ungauged supergravity with \(k=+1\) to a solution of gauged supergravity with an arbitrary \(k\). As an example we discuss a solution for the STU model of gauged supergravity which is incidentally also a solution of \(D=5\), \(N=4\) and \(N=8\) gauged supergravity. This solution is specified by three charges, the asymptotic negative cosmological constant (minimum of the potential) and a non-extremality parameter. While its BPS-saturated limit has a naked singularity, we find a lower bound on the non-extremality parameter (or equivalently on the ADM mass) for which the non-extreme solutions are regular. When this bound is saturated the extreme (non-supersymmetric) solution has zero Hawking temperature and finite entropy. Analogous qualitative features are expected to emerge for black hole solutions in \(D=4\) gauged supergravity as well.

MSC:
83E50 Supergravity
83C57 Black holes
83C75 Space-time singularities, cosmic censorship, etc.
80A10 Classical and relativistic thermodynamics
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