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It spins because the star from which it formed was spinning, and it is now thought that this is actually likely to be the most common form in nature.
A rotating black hole would bulge outward near its equator due to its rotation the faster the spin, the more the bulge. Spinning and non-spinning black holes Source: Penrose and Wheeler went on to prove that any non-rotating starhowever complicated its initial shape and internal structure, would end up after gravitational collapse as a perfectly spherical black holewhose size would depend solely on its mass.
In the late s, Penrose collaborated with his Cambridge friend and colleague, Stephen Hawkingin more investigations into the subject. Such theorems provided a set of sufficient conditions for the existence of a gravitational singularity in space-timeand showed that, far from being mathematical curiosities which appear only in special cases, singularities are actually a fairly generic feature of general relativity.
Although it may seem a very complex, peculiar and perhaps counter-intuitive object, a black hole can essentially be described by just three quantities: Brandon Carter and Stephen Hawking proved the No-Hair Theorem mathematically in the early s, showing that the size and shape of a rotating black hole would depend only on its mass and rate of rotation, and not on the nature of the body that collapsed to form it.
They also proposed four laws of black hole mechanics, analogous to the laws of thermodynamics, by relating mass to energyarea to entropyand surface gravity to temperature.
Hawking radiation as particle pairs are created near a black hole Source: University of St Andrews: According to this theory, black holes are not completely black, and neither do they last forever.
Hawking showed how the strong gravitational field around a black hole can affect the production of matching pairs of particles and anti-particles, as is happening all the time in apparently empty space according to quantum theory.
If the particles are created just outside the event horizon of a black holethen it is possible that the positive member of the pair say, an electron may escape - observed as thermal radiation emitting from the black hole - while the negative particle say, a positronwith its negative energy and negative mass may fall back into the black holeand in this way the black hole would gradually lose mass.
This was perhaps one of the first ever examples of a theory which synthesized, at least to some extent, quantum mechanics and general relativity. Hawking vigorously defended this paradox against the arguments of Leonard Susskind and others for almost thirty years, until he famously retracted his claim ineffectively conceding defeat to Susskind in what had become known as the " black hole war".
He suggests that, as an object falls into a black holea copy of the information that makes it up is sort of scrambled and smeared in two dimensions around the edge of the black hole. Furthermore, Susskind believes that a similar process occurs in the universe as a whole, which raises the rather alarming idea that what we think of as three- dimension al reality is in fact something like a holographic representation of a "real" reality, which is actually contained in two dimensions around the edge of the universe.
It is also theoretically possible that "primordial" or "mini" black holes could have been created in the conditions during the early moments after the Big Bangpossibly in huge numbers. No such mini black holes have ever been observed, however - indeed, they would be extremely difficult to spot - and they remain largely speculative.
It is anyway likely that all but the largest of them would have already evaporated by now as they leak away Hawking radiation. But it is hoped that such mini black holes might be experimentally re-created in the extreme conditions of the Large Hadron Collider at CERN, which, among other things, would lend much-needed credence to some of the current theoretical predictions of superstring theory regarding gravity.The problem with this theory, though, is that it’s based on general relativity.
In recent years, as our understanding of quantum theory has improved, numerous conflicts have . Aug 26, · Professor Stephen Hawking: black holes could be portals to a PARALLEL UNIVERSE FALLING into a black hole in space could send you into a PARALLEL UNIVERSE rather than simply swallowing you up Author: Jon Austin.
Hawking radiation is blackbody radiation that is predicted to be released by black holes, It is named after the physicist Stephen Hawking, The form of the result strongly suggests that the physical description of a gravitating theory can be somehow encoded onto a .
Stephen Hawking: Into a Black Hole. he emerges into a new universe. This is an early example of the science fiction use of a black hole as a wormhole, a passage from one universe to another, or back to another location in the same universe. or even your worst enemies into a black hole, and all the black hole will remember, is the total.
Watch video · In , Stephen Hawking announced black holes evaporate and shrink because they emit radiation. This so-called 'Hawking radiation' was a revolutionary theory but due to the fragile nature of the.
The Description of a Wormhole From Stephen Hawking's Theory PAGES 1. WORDS View Full Essay. More essays like this: time travel, worm holes, wormholes theory, stephen hawking. Not sure what I'd do without @Kibin - Alfredo Alvarez, student @ Miami University. Exactly what I needed.