244 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Hadassah Academic CollegeIL76 papers
- Hadassah Medical CenterIL4 papers
- Ben-Gurion University of the NegevIL3 papers
- Centre National de la Recherche ScientifiqueFR3 papers
- Tel Aviv UniversityIL3 papers
- Achva Academic CollegeIL2 papers
- Hebrew University of JerusalemIL2 papers
- Technion – Israel Institute of TechnologyIL2 papers
- Universidad Autónoma de MadridES2 papers
- University of Colorado DenverUS2 papers
- B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of UkraineUA1 paper
- Cavendish HospitalGB1 paper
9 papers · 2 filters
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…
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…
Kerr-Newman black holes with stationary charged scalar clouds
Shahar Hod
It is shown that Kerr-Newman black holes can support linear charged scalar fields in their exterior regions. To that end, we solve analytically the Klein-Gordon wave equation for a…
Algebraically special resonances of the Kerr-black-hole-mirror bomb
Shahar Hod
A co-rotating bosonic field interacting with a spinning Kerr black hole can extract rotational energy and angular momentum from the hole. This intriguing phenomenon is known as sup…
Onset of superradiant instabilities in the hydrodynamic vortex model
Shahar Hod
The hydrodynamic vortex, an effective spacetime geometry for propagating sound waves, is studied analytically. In contrast with the familiar Kerr black-hole spacetime, the hydrodyn…
Self-gravitating ring of matter in orbit around a black hole: The innermost stable circular orbit
Shahar Hod
We study analytically a black-hole-ring system which is composed of a stationary axisymmetric ring of particles in orbit around a perturbed Kerr black hole of mass . In particul…
Asymptotic late-time tails of massive spin-2 fields
Shahar Hod
The late-time dynamics of massive spin-2 fields in flat and curved spacetimes are studied analytically. We find that the time evolutions of the massive fields are characterized by…