Superradiance
Abstract
Superradiance is a radiation enhancement process that involves dissipative systems. With a 60 yearold history, superradiance has played a prominent role in optics, quantum mechanics and especially in relativity and astrophysics. In General Relativity, blackhole superradiance is permitted by the ergoregion, that allows for energy, charge and angular momentum extraction from the vacuum, even at the classical level. Stability of the spacetime is enforced by the event horizon, where negative energystates are dumped. Blackhole superradiance is intimately connected to the blackhole area theorem, Penrose process, tidal forces, and even Hawking radiation, which can be interpreted as a quantum version of blackhole superradiance. Various mechanisms (as diverse as massive fields, magnetic fields, antide Sitter boundaries, nonlinear interactions, etc...) can confine the amplified radiation and give rise to strong instabilities. These "blackhole bombs" have applications in searches of dark matter and of physics beyond the Standard Model, are associated to the threshold of formation of new black hole solutions that evade the nohair theorems, can be studied in the laboratory by devising analog models of gravity, and might even provide a holographic description of spontaneous symmetry breaking and superfluidity through the gaugegravity duality. This work is meant to provide a unified picture of this multifaceted subject. We focus on the recent developments in the field, and work out a number of novel examples and applications, ranging from fundamental physics to astrophysics.
 Publication:

Lecture Notes in Physics, Berlin Springer Verlag
 Pub Date:
 2015
 arXiv:
 arXiv:1501.06570
 Bibcode:
 2015LNP...906.....B
 Keywords:

 Physics;
 General Relativity and Quantum Cosmology;
 Astrophysics  High Energy Astrophysical Phenomena;
 High Energy Physics  Phenomenology;
 High Energy Physics  Theory;
 Physics  Fluid Dynamics
 EPrint:
 277 pages. Second Edition of the "Lecture Notes in Physics" book by SpringerVerlag. Overall improvement, typos and incorrect statements of Edition 1 are now corrected