| A twin universe before the Big Bang? |
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| Wednesday, 16 April 2008 | |
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What happened there before the Big Bang? This issue has she even make sense? Yes, according to the theories of quantum gravity loop. Two researchers of this esoteric field of theoretical physics have just published an article in which they concluded that a universe like ours existed before him and may have been the cause of our galaxy.
Last year, Martin Bojowald, one of the world's specialists Loop Quantum Gravity (LQG), loop quantum gravity, in Nature published the results of its recent work on quantum cosmology. The researcher had used approximations for the equations of the LQG complete when they are applied to the problem of paramount cosmology, where the gravitational field and the curvature of space-time becomes so strong that the equations of general relativity should necessarily be used in a form compatible with the equations of quantum mechanics. Bojowald had come to the conclusion that our universe resulted from an unending cycle probably expansions and contractions. While, as demonstrated Roger Penrose and Stephen Hawking in the context of classical equations of Einstein's general relativity, a cosmic singularity absolute marking the beginning of time was inevitable, the quantum equations of the LQG predicted a minimum value for the size of a contraction in the universe, with a density of matter-energy maximum, followed by a rebound leading to a new phase of expansion. According Bojowald, although it should be borne in mind that these results came from rough calculations, this conclusion should be generic and applicable to large classes of models of quantum cosmology in LQG. Each new phase of the Universe suffering from amnesia almost complete what happened in the previous one, had a profound differences exist between two successive stages of the Universe. Maybe traces of the pre-Big Bang in the CMB and distribution of galaxy clusters This assumption may be false according Parampreet Singh of the Perimeter Institute for Theoretical Physics in Waterloo (Canada) and Alejandro Corichi of the National Autonomous University of Mexico. If our universe has been preceded by another, having suffered a rebound after his size had become tiny (100 times the length of approximately Planck), the forerunner of our universe would be his quasi-twin. Moreover, even today, the fossilized remains of what happened before the Big Bang could well be at the level of fluctuations in the CMB. In reaching this conclusion, the two researchers have pushed a little further calculations Martin Bojowald and discovered that the quantities of energy and materials contained in the earlier phase of our universe should be the same as at present. Better still, to an excellent approximation near, the level and the structure of space-time before the bounce, to a level neither classical nor quantum really, should be retained in some form and to be still here today. Thus, our universe, without being an exact replica of his twin, especially with a different story, like him a lot. The temperature fluctuations in the CMB (the CMB observed by WMap) would probably be the direct heirs of those existing before the start of rebound. However, these temperature fluctuations reflect the density fluctuations of germs used in the formation of our galaxy. By studying the structure of the CMB, as well as that of the galaxy cluster, we could perhaps learn more about what happened before the Big Bang, especially scientifically tested this theory speculative. |
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