Rotating black hole
rotating black hole, rotating black holesA rotating black hole is a black hole that possesses angular momentum In particular, it rotates about one of its axes of symmetry The boundaries of a Kerr black hole relevant to astrophysics Note that there are no physical "surfaces" as such The boundaries are mathematical surfaces, or sets of points in spacetime, relevant to analysis of the black hole's properties and interactions[1]
Contents
 1 Types of black holes
 2 Formation
 21 Relation with gamma ray bursts
 3 Conversion to a Schwarzschild black hole
 4 Kerr metric, Kerr–Newman metric
 5 See also
 6 References
 7 Further reading
Types of black holes
There are four known, exact, black hole solutions to the Einstein field equations, which describe gravity in general relativity Two of those rotate: the Kerr and Kerr–Newman black holes It is generally believed that every black hole decays rapidly to a stable black hole; and, by the nohair theorem, that except for quantum fluctuations stable black holes can be completely described at any moment in time by these eleven numbers:
 massenergy M,
 linear momentum P three components,
 angular momentum J three components,
 position X three components,
 electric charge Q
These numbers represent the conserved attributes of an object which can be determined from a distance by examining its electromagnetic and gravitational fields All other variations in the black hole will either escape to infinity or be swallowed up by the black hole This is because anything happening inside the black hole horizon cannot affect events outside of it
In terms of these properties, the four types of black holes can be defined as follows:
Nonrotating J = 0  Rotating J > 0  
Uncharged Q = 0  Schwarzschild  Kerr 
Charged Q ≠ 0  Reissner–Nordström  Kerr–Newman 
Formation
Rotating black holes are formed in the gravitational collapse of a massive spinning star or from the collapse of a collection of stars or gas with a total nonzero angular momentum As most stars rotate it is expected that most black holes in nature are rotating black holes In late 2006, astronomers reported estimates of the spin rates of black holes in The Astrophysical Journal A black hole in the Milky Way, GRS 1915+105, may rotate 1,150 times per second,[2] approaching the theoretical upper limit
Relation with gamma ray bursts
The formation of a rotating black hole by a collapsar is thought to be observed as the emission of gamma ray bursts
Conversion to a Schwarzschild black hole
A rotating black hole can produce large amounts of energy at the expense of its rotational energy This happens through the Penrose process in the black hole's ergosphere, an area just outside its event horizon In that case a rotating black hole gradually reduces to a Schwarzschild black hole, the minimum configuration from which no further energy can be extracted, although the Kerr black hole's rotation velocity will never quite reach zero
Kerr metric, Kerr–Newman metric
Further information: Kerr metric and Kerr–Newman metricA rotating black hole is a solution of Einstein's field equation There are two known exact solutions, the Kerr metric and the Kerr–Newman metric, which are believed to be representative of all rotating black hole solutions, in the exterior region
See also
 Kerr black holes as wormholes
 BKL singularity – solution representing interior geometry of black holes formed by gravitational collapse
 Penrose process
 Ergosphere
 Spinflip
 Black hole bomb
References
 ^ Matt Visser: The Kerr spacetime – a brief introduction arXiv:07060622, Page 35
 ^ Black hole spins at the limit  COSMOS magazine
Further reading
 C W Misner, K S Thorne, J A Wheeler, J Wheeler, and K Thorne, Gravitation Physics Series, 2nd ed W H Freeman, September 1973
 Melia, Fulvio, The Galactic Supermassive Black Hole, Princeton U Press, 2007
 Macvey, John W, Time Travel, Scarborough House, 1990
 

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29.10.2014
Rotating black hole
Rotating black hole
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