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No-scalar-hair theorem for spherically symmetric reflecting stars
Shahar Hod
It is proved that spherically symmetric compact reflecting objects cannot support static bound-state configurations made of scalar fields whose self-interaction potential …
The spinning Kerr-black-hole-mirror bomb: A lower bound on the radius of the reflecting mirror
Shahar Hod
The intriguing superradiant amplification phenomenon allows an orbiting scalar field to extract rotational energy from a spinning Kerr black hole. Interestingly, the energy extract…
Spinning Kerr black holes with stationary massive scalar clouds: The large-coupling regime
Shahar Hod
We study analytically the Klein-Gordon wave equation for stationary massive scalar fields linearly coupled to spinning Kerr black holes. In particular, using the WKB approximation,…
Analytic treatment of the system of a Kerr-Newman black hole and a charged massive scalar field
Shahar Hod
Charged rotating Kerr-Newman black holes are known to be superradiantly unstable to perturbations of charged massive bosonic fields whose proper frequencies lie in the bounded regi…
Upper bound on the center-of-mass energy of the collisional Penrose process
Shahar Hod
Following the interesting work of Bañados, Silk, and West [Phys. Rev. Lett. {\bf 103}, 111102 (2009)], it is repeatedly stated in the physics literature that the center-of-mass ene…
Slowly decaying resonances of charged massive scalar fields in the Reissner-Nordström black-hole spacetime
Shahar Hod
We determine the characteristic timescales associated with the linearized relaxation dynamics of the composed Reissner-Nordström-black-hole-charged-massive-scalar-field system. To…