Black Hole Hair Removal For N=4 CHL Models

Abstract

Although BMPV black holes in flat space and in Taub-NUT space have identical near-horizon geometries, they have different indices from the microscopic analysis. For K3 compactification of type IIB theory, Sen et al in a series of papers identified that the key to resolving this puzzle is the black hole hair modes: smooth, normalisable, bosonic and fermionic degrees of freedom living outside the horizon. In this paper, we extend their study to N = 4 CHL orbifold models. For these models, the puzzle is more challenging due to the presence of the twisted sectors. We identify hair modes in the untwisted as well as twisted sectors. We show that after removing the contributions of the hair modes from the microscopic partition functions, the 4d and 5d horizon partition functions agree. Special care is taken to present details on the smoothness analysis of hair modes for rotating black holes, thereby filling an essential gap in the literature.

64 pages, no figures, 4 tables; v2: typos corrected + ref and note added + discussions added/improved in section 7, version to appear in JHEP; v3: typos corrected + refs added; v4: table 3 + two paragraphs in section 7.1 corrected, footnote 8 added, supersedes published version

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Cited by in corpus (2)

• Positivity of discrete information for CHL black holes
• Horizon states and the sign of their index in $\mathcal{N}=4$ dyons