Abstract
We develop the formalism of supersymmetric localization in supergravity using the deformed BRST algebra defined in the presence of a supersymmetric background as recently formulated in [1]. The gravitational functional integral localizes onto the cohomology of a global supercharge Qeq, obeying Qeq2 = H, where H is a global symmetry of the background. Our construction naturally produces a twisted version of supergravity whenever supersymmetry can be realized off-shell. We present the details of the twisted graviton multiplet and ghost fields for the superconformal formulation of four-dimensional mathcal{N} = 2 supergravity. As an application of our formalism, we systematize the computation of the exact quantum entropy of supersymmetric black holes. In particular, we compute the one-loop determinant of the Qeq mathcal{V} deformation operator for the off-shell fluctuations of the Weyl multiplet around the AdS2 × S2 saddle. This result, which is consistent with the corresponding large-charge on-shell analysis, is needed to complete the first-principles computation of the quantum entropy.
Highlights
The program of computing the exact macroscopic quantum entropy of supersymmetric black holes in string theory has made good strides since its inception [2, 3]
We develop the formalism of supersymmetric localization in supergravity using the deformed BRST algebra defined in the presence of a supersymmetric background as recently formulated in [1]
By choosing a background field configuration that admits a global supersymmetry algebra, we construct a rigid fermionic generator Qeq which is a deformation of the BRST algebra and obeys Q2eq = H with H being an isometry of the background
Summary
The program of computing the exact macroscopic quantum entropy of supersymmetric black holes in string theory has made good strides since its inception [2, 3]. In the simplest cases one can go much beyond the leading asymptotic analysis of [4, 5], and compute exact integer degeneracies from a continuum calculation in macroscopic string theory, providing valuable lessons about the quantization of the gravitational degrees of freedom of a black hole. This has been made possible by the application of the technique of supersymmetric localization to supergravity in the near-horizon AdS2 region of BPS black holes. In the rest of the introduction, we explain these two questions, their resolution, and their consequences in some detail
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