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A rotating black hole is a black hole that possesses angular momentum. In particular, it rotates about one of its axes of symmetry. All celestial objects – planets, stars , galaxies, black holes – spin. [1] [2] [3] The boundaries of a Kerr black hole relevant to astrophysics. Note that there are no physical "surfaces" as such.
The Kerr metric or Kerr geometry describes the geometry of empty spacetime around a rotating uncharged axially symmetric black hole with a quasispherical event horizon.The Kerr metric is an exact solution of the Einstein field equations of general relativity; these equations are highly non-linear, which makes exact solutions very difficult to find.
That’s what a rotating black hole does. In Einstein’s theory, space and time relate to each other. That’s why it’s called space-time. So as the black hole is rotating, it’s actually ...
the interior of a rotating BTZ black hole; the van Stockum dust (which models a cylindrically symmetric configuration of dust) the Gödel lambda dust (which models a dust with a carefully chosen cosmological constant term) the Tipler cylinder (a cylindrically symmetric metric with CTCs) Bonnor-Steadman solutions describing laboratory situations ...
Ergosphere – region located outside a rotating black hole. Hawking radiation – black-body radiation that is predicted to be emitted by black holes, due to quantum effects near the event horizon. [2] Penrose process – process theorised by Roger Penrose wherein energy can be extracted from a rotating black hole.
The Schwarzschild metric of a black hole and the Kerr metric of a rotating black hole are common examples of stationary spacetimes. By definition, a stationary spacetime exhibits time translation symmetry. This is technically called a time-like Killing vector. Because the system has a time translation symmetry, Noether's theorem guarantees that ...
[7] [8] Elvang identified that black holes and black rings can coexist if they are spinning. [9] She named the combination of a spherical black hole surrounded by a black ring a 'Black Saturn'. [10] After her fellowship, Elvang joined the Institute for Advanced Study as a postdoctoral researcher. [7]
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