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Smooth extremal horizons are the exception, not the rule
Gary T. Horowitz, Jorge E. Santos
We show that the general charged, rotating black hole in five-dimensional Einstein-Maxwell theory has a singular extremal limit. Only the known analytic solutions with exactly zero…
Sudden breakdown of effective field theory near cool Kerr-Newman black holes
Gary T. Horowitz, Maciej Kolanowski, Grant N. Remmen +1
It was recently shown that (near-)extremal Kerr black holes are sensitive probes of small higher-derivative corrections to general relativity. In particular, these corrections prod…
Extremal Kerr black holes as amplifiers of new physics
Gary T. Horowitz, Maciej Kolanowski, Grant N. Remmen +1
We show that extremal Kerr black holes are sensitive probes of new physics. Stringy or quantum corrections to general relativity are expected to generate higher-curvature terms in…
A deformed IR: a new IR fixed point for four-dimensional holographic theories
Gary T. Horowitz, Maciej Kolanowski, Jorge E. Santos
In holography, the IR behavior of a quantum system at nonzero density is described by the near horizon geometry of an extremal charged black hole. It is commonly believed that for…
Almost all extremal black holes in AdS are singular
Gary T. Horowitz, Maciej Kolanowski, Jorge E. Santos
We investigate the geometry near the horizon of a generic, four-dimensional extremal black hole. When the cosmological constant is negative, we show that (in almost all cases) tida…
Bouncing inside the horizon and scrambling delays
Gary T. Horowitz, Henry Leung, Leonel Queimada +1
We study charged perturbations of the thermofield double state dual to a charged AdS black hole. We model the perturbation by a massless charged shell in the bulk. Unlike the neutr…
An infinity of black holes
Gary T. Horowitz, Diandian Wang, Xiaohua Ye
In general relativity (without matter), there is typically a one parameter family of static, maximally symmetric black hole solutions labelled by their mass. We show that there are…
Inside an Asymptotically Flat Hairy Black Hole
Oscar J. C. Dias, Gary T. Horowitz, Jorge E. Santos
We study the interior of a recently constructed family of asymptotically flat, charged black holes that develop (charged) scalar hair as one increases their charge at fixed mass. I…
Extremal black holes that are not extremal: maximal warm holes
Oscar J. C. Dias, Gary T. Horowitz, Jorge E. Santos
We study a family of four-dimensional, asymptotically flat, charged black holes that develop (charged) scalar hair as one increases their charge at fixed mass. Surprisingly, the ma…
Boundary Causality Violating Metrics in Holography
Sergio Hernández-Cuenca, Gary T. Horowitz, Gabriel Treviño +1
Even for holographic theories that obey boundary causality, the full bulk Lorentzian path integral includes metrics that violate this condition. This leads to the following puzzle:…
Diving into a holographic superconductor
Sean A. Hartnoll, Gary T. Horowitz, Jorrit Kruthoff +1
Charged black holes in anti-de Sitter space become unstable to forming charged scalar hair at low temperatures . This phenomenon is a holographic realization of sup…
Gravitational duals to the grand canonical ensemble abhor Cauchy horizons
Sean A. Hartnoll, Gary T. Horowitz, Jorrit Kruthoff +1
The gravitational dual to the grand canonical ensemble of a large holographic theory is a charged black hole. These spacetimes -- for example Reissner-Nordström-AdS -- can have…
Bulk reconstruction of metrics with a compact space asymptotically
Sergio Hernández-Cuenca, Gary T. Horowitz
Holographic duality implies that the geometric properties of the gravitational bulk theory should be encoded in the dual field theory. These naturally include the metric on dimensi…
Gravitational Corner Conditions in Holography
Gary T. Horowitz, Diandian Wang
Contrary to popular belief, asymptotically anti-de Sitter solutions of gravitational theories cannot be obtained by taking initial data (satisfying the constraints) on a spacelike…
Creating a Traversable Wormhole
Gary T. Horowitz, Don Marolf, Jorge E. Santos +1
We argue that one can nucleate a traversable wormhole via a nonperturbative process in quantum gravity. To support this, we construct spacetimes in which there are instantons givin…
A Holographic Argument for the Penrose Inequality in AdS
Netta Engelhardt, Gary T. Horowitz
We give a holographic argument in favor of the AdS Penrose inequality, which conjectures a lower bound on the total mass in terms of the area of apparent horizons. This inequality…
Further evidence for the weak gravity -- cosmic censorship connection
Gary T. Horowitz, Jorge E. Santos
We have recently shown that a class of counterexamples to (weak) cosmic censorship in anti-de Sitter spacetime is removed if the weak gravity conjecture holds. Surprisingly, the mi…
Deforming black holes in AdS
Gary T. Horowitz, Jorge E. Santos, Chiara Toldo
We investigate how changes in the boundary metric affect the shape of AdS black holes. Most of our work is analytic and based on the AdS C-metric. Both asymptotically hyperbolic an…
Attempts at vacuum counterexamples to cosmic censorship in AdS
Toby Crisford, Gary T. Horowitz, Jorge E. Santos
We consider vacuum solutions of four dimensional general relativity with . We numerically construct stationary solutions that asymptotically approach a boundary metric with d…
Detachable circles and temperature-inversion dualities for CFT
Gary T. Horowitz, Edgar Shaghoulian
We use a Weyl transformation between and to relate a conformal field theory at arbitrary temperature on to…
Testing the Weak Gravity -- Cosmic Censorship Connection
Toby Crisford, Gary T. Horowitz, Jorge E. Santos
A surprising connection between the weak gravity conjecture and cosmic censorship has recently been proposed. In particular, it was argued that a promising class of counterexamples…
Comments on Black Holes in Bubbling Spacetimes
Gary T. Horowitz, Hari K. Kunduri, James Lucietti
In five-dimensional minimal supergravity, there are spherical black holes with nontrivial topology outside the horizon which have the same conserved charges at infinity as the BMPV…
Recovering the spacetime metric from a holographic dual
Netta Engelhardt, Gary T. Horowitz
We review our recent proposal to use certain spatial cross-sections of the boundary at infinity -- light-cone cuts -- to recover the conformal metric in the bulk. We discuss some e…
New Insights into Quantum Gravity from Gauge/gravity Duality
Netta Engelhardt, Gary T. Horowitz
Using gauge/gravity duality, we deduce several nontrivial consequences of quantum gravity from simple properties of the dual field theory. These include: (1) a version of cosmic ce…