Moulting Black Holes

Abstract

We find a family of novel supersymmetric phases of the D1-D5 CFT, which in certain ranges of charges have more entropy than all known ensembles. We also find bulk BPS configurations that exist in the same range of parameters as these phases, and have more entropy than a BMPV black hole; they can be thought of as coming from a BMPV black hole shedding a "hair" condensate outside of the horizon. The entropy of the bulk configurations is smaller than that of the CFT phases, which indicates that some of the CFT states are lifted at strong coupling. Neither the bulk nor the boundary phases are captured by the elliptic genus, which makes the coincidence of the phase boundaries particularly remarkable. Our configurations are supersymmetric, have non-Cardy-like entropy, and are the first instance of a black hole entropy enigma with a controlled CFT dual. Furthermore, contrary to common lore, these objects exist in a region of parameter space (between the "cosmic censorship bound" and the "unitarity bound") where no black holes were thought to exist.

51 pages, 15 figures. Print in color to enjoy. v2: References added, clarifications in Introduction, and a new appendix added to explain units and conventions. v3: the spectral flow argument in section 3 improved

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• Holographic superconductivity in M-Theory
• Superconductors from Superstrings
• Notes on the K3 Surface and the Mathieu group M_24
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• Holographic End-Point of Spatially Modulated Phase Transition
• Spatially Modulated Phase in Holographic Quark-Gluon Plasma
• A fixed point formula for the index of multi-centered N=2 black holes
• U-duality and non-BPS solutions
• Spectral Flow, and the Spectrum of Multi-Center Solutions
• A Striped Holographic Superconductor
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• Spinning Strings as Small Black Rings
• A non-homogeneous ground state of the low-temperature Sakai-Sugimoto model
• Holographic Charge Density Waves
• Intertwining Relations for the Deformed D1D5 CFT
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• Scaling BPS Solutions and pure-Higgs States
• New D1-D5-P geometries from string amplitudes
• Linearity of Holographic Entanglement Entropy
• Microstates at the boundary of AdS
• String Theory of Supertubes
• Black-Hole Entropy from Supergravity Superstrata States
• Little Strings, Long Strings, and Fuzzballs
• Stringy Structure at the BPS Bound
• Hot Halos and Galactic Glasses
• Black hole non-uniqueness via spacetime topology in five dimensions
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• Elliptic Genera and 3d Gravity
• The first law of soliton and black hole mechanics in five dimensions
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• Shockwaves in black hole microstate geometries
• Black lenses in string theory
• Modulated Instability in Five-Dimensional U(1) Charged AdS Black Hole with R**2-term
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• Almost BPS but still not renormalized
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• Bound states of spinning black holes in five dimensions
• Camouflaged Supersymmetry
• The Yang-Mills duals of small AdS black holes
• Interpolating between multi-center microstate geometries
• Black rings with fourth dipole cause less hair loss
• Instabilities of microstate geometries with antibranes
• Schwarzschild-AdS Black Holes in N=2 Geometric Flux Compactification
• A New Supersymmetry Index for the D1-D5 CFT
• A Reverse Black Hole Information Problem
• The Resolved Elliptic Genus and the D1-D5 CFT
• On the Search for Multicenter AdS Black Holes from M-theory
• AdS_3: the NHEK generation