Floating Orbits, Superradiant Scattering and the Black-hole Bomb

  title={Floating Orbits, Superradiant Scattering and the Black-hole Bomb},
  author={William H. Press and Saul A. Teukolsky},
Penrose1 and Christodoulou2 have shown how, in principle, rotational energy can be extracted from a black hole by orbiting and fissioning particles. Recently, Misner3 has pointed out that waves can also extract rotational energy (“superradiant scattering” in which an impinging wave is amplified as it scatters off a rotating hole). As one application of super-radiant scattering, Misner has suggested the possible existence of “floating orbits”, that is, orbits in which a particle radiatively… 

Black hole superradiance as a probe of ultra-light new particles

  • R. Lasenby
  • Physics
    Proceedings of the International Astronomical Union
  • 2016
Abstract Bosonic fields around a spinning black hole can be amplified via ‘superradiance’, a wave analogue of the Penrose process, which extracts energy and momentum from the black hole. For

Superradiance by mini black holes with mirror

A bstractThe superradiant scattering of massive scalar particles by a rotating mini black hole is investigated. Imposing the mirror boundary condition, the system becomes the so called black-hole

Floating and sinking: the imprint of massive scalars around rotating black holes.

It is shown that matter can hover into "floating orbits" for which the net gravitational energy loss at infinity is entirely provided by the black hole's rotational energy, and these effects could be a smoking gun of deviations from general relativity.


A particle scattered off by a rotating black hole can be amplified when the system is in the superradiant regime. If the system is surrounded by a mirror which reflects the particle back to the black

Gravitational waves from superradiant instabilities of rotating black holes

Direct detection of gravitational waves from several compact binary coalescences has ushered in a new era of astronomy. It has opened up the possibility of detecting ultralight bosons, predicted by

Black hole bombs and explosions: from astrophysics to particle physics

Black holes are the elementary particles of gravity, the final state of sufficiently massive stars and of energetic collisions. With a 40-year long history, black hole physics is a fully-blossomed

A new type of charged black hole bomb

Black hole bombs are usually constructed by surrounding an ergoregion by a mirror. The fields propagating between the event horizon and the mirror are prevented from escaping to infinity and

Gravitational collider physics

We study the imprints of new ultralight particles on the gravitational-wave signals emitted by binary black holes. Superradiant instabilities may create large clouds of scalar or vector fields around

Gravitational wave signatures of ultralight vector bosons from black hole superradiance

In the presence of an ultralight bosonic field, spinning black holes are unstable to superradiance. The rotational energy of the black hole is converted into a nonaxisymmetric, oscillating boson



Global structure of the Kerr family of gravitational fields

The Kerr family of solutions of the Einstein and Einstein-Maxwell equations is the most general class of solutions known at present which could represent the field of a rotating neutral or

Maximal Analytic Extension of the Kerr Metric

Kruskal's transformation of the Schwarzschild metric is generalized to apply to the stationary, axially symmetric vacuum solution of Kerr, and is used to construct a maximal analytic extension of the

Interpretation of gravitational-wave observations.

Weber's (1971) interpretation of his observations involving a source at the center of the Galaxy isotropically radiating in the form of gravitational waves is discussed. The gravitational-wave flux

Reversible and Irreversible Transformations in Black-Hole Physics

The concepts of irreducible mass and of reversible and irreversible transformations in black holes are introduced, leading to the formula