Higher Derivative Corrections to Non-supersymmetric Extremal Black Holes in N=2 Supergravity

TL;DR

This paper computes the entropy of extremal black holes in N=2 supergravity with higher derivative corrections, revealing agreements with previous results for supersymmetric cases and discrepancies for some non-supersymmetric cases related to dimensional reduction effects.

Contribution

It provides a detailed analysis of higher derivative corrections to black hole entropy in N=2 supergravity, highlighting differences between four and five dimensional theories for non-supersymmetric cases.

Findings

Agreement with previous results for supersymmetric black holes.

Discrepancies in non-supersymmetric cases suggest missing terms in four-dimensional supersymmetrization.

Indicates limitations of supersymmetrization in capturing all higher-dimensional effects.

Abstract

Using the entropy function formalism we compute the entropy of extremal supersymmetric and non-supersymmetric black holes in N=2 supergravity theories in four dimensions with higher derivative corrections. For supersymmetric black holes our results agree with all previous analysis. However in some examples where the four dimensional theory is expected to arise from the dimensional reduction of a five dimensional theory, there is an apparent disagreement between our results for non-supersymmetric black holes and those obtained by using the five dimensional description. This indicates that for these theories supersymmetrization of the curvature squared term in four dimension does not produce all the terms which would come from the dimensional reduction of a five dimensional action with curvature squared terms.