Extremal non-BPS black holes and entropy extremization

Abstract

At the horizon, a static extremal black hole solution in N=2 supergravity in four dimensions is determined by a set of so-called attractor equations which, in the absence of higher-curvature interactions, can be derived as extremization conditions for the black hole potential or, equivalently, for the entropy function. We contrast both methods by explicitly solving the attractor equations for a one-modulus prepotential associated with the conifold. We find that near the conifold point, the non-supersymmetric solution has a substantially different behavior than the supersymmetric solution. We analyze the stability of the solutions and the extrema of the resulting entropy as a function of the modulus. For the non-BPS solution the region of attractivity and the maximum of the entropy do not coincide with the conifold point.

19 pages, 4 figures, AMS-LaTeX, reference added

References in corpus (3)

• On some properties of the Attractor Equations
• On the critical points of the entropic principle
• Entropy Maximization in the Presence of Higher-Curvature Interactions

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• Entropy Function for Non-Extremal Black Holes in String Theory
• On the Entropy Function and the Attractor Mechanism for Spherically Symmetric Extremal Black Holes
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