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Black hole which possesses angular momentum

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 (Sun), galaxies, black holes – spin.

Rotating black holes are formed in the gravitational collapse of a massive spinning star or from the collapse or collision of a collection of compact objects, stars, or gas with a total non zero angular momentum. As all known stars rotate and realistic collisions have non zero angular momentum, it is expected that all black holes in nature are rotating black holes. approaching the theoretical upper limit.

The formation of a rotating black hole by a collapsar is thought to be observed as the emission of gamma ray bursts.

A rotating black hole can produce large amounts of energy at the expense of its rotational energy. This can happen through the Penrose process inside the black hole's ergosphere, in the volume outside its event horizon. In some cases of energy extraction, a rotating black hole may gradually reduce 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.

A 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. In the vicinity of a black hole, space curves so much that light rays are deflected, and very nearby light can be deflected so much that it travels several times around the black hole. Hence, when we observe a distant background galaxy (or some other celestial body), we may be lucky to see the same image of the galaxy multiple times, albeit more and more distorted. A complete mathematical description for how light bends around the equatorial plane of a Kerr black hole was published in 2021. In 2022, it was mathematically demonstrated that the equilibrium found by Roy Kerr in 1963 was stable and thus black holes—which were the solution to Einstein's equation of 1915—were stable.

Rotating black holes have two temperature states they can exist in: heating (losing energy) and cooling.

Kerr black holes are featured extensively in the 2009 visual novel Steins;Gate (also TV / manga), for their possibilities in time travelling. These are, however, magnified greatly for the purpose of story telling. Kerr black holes are also key to the "Swan Song" project by Joe Davis. They are also a key element in the 2014 film Interstellar.