From the 1 of 5 linked papers with an AI index.
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Dirichlet walls and the end of time
Hanako Helton, Gary T. Horowitz, Donald Marolf
The paper investigates how imposing Dirichlet boundary conditions on a finite surface in Einstein-Hilbert gravity can cause evolutions to end in finite time due to singularities re…
Axions Create Singularities on Extremal Horizons
Gary T. Horowitz, Maciej Kolanowski, Grant N. Remmen +1
We show that axions cause extremal black holes to have singular horizons. This is true for almost all values of the axion mass and coupling provided the black hole is rotating and…
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…
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…