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Newman, E.T., Couch, E., Chinnapared, K., Exton, A., Prakash, A., Torrence, R.: J.
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The solution is expressed in the Newman-Penrose formalism. No changes in the structure of null geodesics are recorded, but significant differences are obtained for timelike geodesics, particularly an increase in the perihelion precession and the non-existence of circular timelike orbits. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features Press Copyright Contact us Creators. The boundary that delineates that point of no return is called the event horizon, and a sort of opaque 'wrapping' that doesn't let you see the singularity itself. If the core's mass is more than about three times the mass of the Sun, the equations showed, the force of gravity overwhelms all other forces and produces a black hole. Physical quantities such as the surface gravity and other effects like perihelion precession, light bending and circular orbits are studied in this spacetime and compared to their counterparts in the gravitational field of the isolated Schwarzschild black hole. Black holes form when a very massive star dies and its core collapses into a space so small that not even light can escape it. Most famously, black holes were predicted by Einstein's theory of general relativity, which showed that when a massive star dies, it leaves behind a small, dense remnant core. It is difficult to grasp the depth of scale when you speak of sub atomic particles and the distances between objects in the universe. I like to think about what was here before the Big Bang occurred. We could be a universe within another universe. The metric representing the black hole spacetime is obtained by applying a time dependent conformal transformation on the Schwarzschild metric, such that the result is an exact solution with a matter content described by a two-fluid source. There could be dark matter and dark energy holding the universe together.
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Such models were originally proposed by theoretical physicist Raj Pathria, and concurrently by mathematician I. The black hole is primordial in the sense that it forms ab initio with the big bang singularity and its expanding event horizon is represented by a conformal Killing horizon. A black hole cosmology (also called Schwarzschild cosmology or black hole cosmological model) is a cosmological model in which the observable universe is the interior of a black hole. As an example of a dynamical cosmological black hole, a spacetime that describes an expanding black hole in the asymptotic background of the Einstein-de Sitter universe is constructed.