3 papers
hep-th2025
Frozen Firewall: Generic Singularity Formation on an Extremal Horizon
Gary T. Horowitz, Maciej Kolanowski, Jorge E. Santos
It is known that linearized perturbations of extremal black holes result in growing curvature on the horizon. However, nonlinear perturbations typically do not evolve to extremal b…
hep-th2025
Constraints are not enough
Gary T. Horowitz, Donald Marolf, Jorge E. Santos
The Euclidean Einstein-Hilbert action is well-known to be unbounded below and thus to raise many questions regarding the definition of the gravitational path integral. A variety of…
hep-th2024
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…