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Onset of superradiant instabilities in the composed Kerr-black-hole-mirror bomb
Shahar Hod
It was first pointed out by Press and Teukolsky that a system composed of a spinning Kerr black hole surrounded by a reflecting mirror may develop instabilities. The physical mecha…
Self-gravitating field configurations: The role of the energy-momentum trace
Shahar Hod
Static spherically-symmetric matter distributions whose energy-momentum tensor is characterized by a non-negative trace are studied analytically within the framework of general rel…
Rotating black holes can have short bristles
Shahar Hod
The elegant `no short hair' theorem states that, if a spherically-symmetric static black hole has hair, then this hair must extend beyond 3/2 the horizon radius. In the present pap…
The instability spectrum of weakly-magnetized SU(2) Reissner-Nordström black holes
Shahar Hod
It is well known that the U(1) Reissner-Nordström black hole is stable within the framework of the Einstein-Maxwell theory. However, the SU(2) Reissner-Nordström black-hole solutio…
Resonance spectra of caged black holes
Shahar Hod
Recent numerical studies of the coupled Einstein-Klein-Gordon system in a cavity have provided compelling evidence that {\it confined} scalar fields generically collapse to form bl…
A short remark (with a long title) on the universality of the quasinormal spectrum of near-extremal Kerr-Newman black holes
Shahar Hod
In a recent paper (arXiv:1410.0694) Zilhão, Cardoso, Herdeiro, Lehner, and Sperhake have studied the nonlinear stability of Kerr-Newman black holes. We show that their numerical re…