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- Hadassah Academic CollegeIL76 papers
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5 papers · 1 filter
Stationary Scalar Clouds Around Rotating Black Holes
Shahar Hod
Motivated by novel results in the theory of wave dynamics in black-hole spacetimes, we analyze the dynamics of a massive scalar field surrounding a rapidly rotating Kerr black hole…
Spherical null geodesics of rotating Kerr black holes
Shahar Hod
The non-equatorial spherical null geodesics of rotating Kerr black holes are studied analytically. Unlike the extensively studied equatorial circular orbits whose radii are known a…
Resonance spectrum of near-extremal Kerr black holes in the eikonal limit
Shahar Hod
The fundamental resonances of rapidly rotating Kerr black holes in the eikonal limit are derived analytically. We show that there exists a critical value, $μ_c=\sqrt{{15-\sqrt{193}…
Quasinormal resonances of a charged scalar field in a charged Reissner-Nordström black hole spacetime: A WKB analysis
Shahar Hod
The fundamental quasinormal resonances of charged Reissner-Nordström black holes due to charged scalar perturbations are derived {\it analytically}. In the WKB regime, …
On the instability regime of the rotating Kerr spacetime to massive scalar perturbations
Shahar Hod
The instability of rotating Kerr black holes due to massive scalar perturbations is investigated. It is well known that a bosonic field impinging on a Kerr black hole can be amplif…