10/3/2023 0 Comments Cosmic horizon definitionIt proposes a period of extremely rapid (exponential) expansion of the universe prior to the more gradual Big Bang expansion, during which time the energy density of the universe was dominated by a cosmological constant-type of vacuum energy that later decayed to produce the matter and radiation that fill the universe today. The Inflation Theory, developed by Alan Guth, Andrei Linde, Paul Steinhardt, and Andy Albrecht, offers solutions to these problems and several other open questions in cosmology. However, magnetic monopoles have never been observed, so if they exist at all, they are much more rare than the Big Bang theory predicts. Yet the uniformity of the cosmic microwave background temperature tells us that these regions must have been in contact with each other in the past.īig Bang cosmology predicts that a very large number of heavy, stable "magnetic monopoles" should have been produced in the early universe. This is because the light travel time between them exceeds the age of the universe. A universe as flat as we see it today would require an extreme fine-tuning of conditions in the past, which would be an unbelievable coincidence.ĭistant regions of space in opposite directions of the sky are so far apart that, assuming standard Big Bang expansion, they could never have been in causal contact with each other. However, under Big Bang cosmology, curvature grows with time. WMAP has determined the geometry of the universe to be nearly flat. While the Big Bang theory successfully explains the "blackbody spectrum" of the cosmic microwave background radiation and the origin of the light elements, it has three significant problems: It was developed around 1980 to explain several puzzles with the standard Big Bang theory, in which the universe expands relatively gradually throughout its history. The Inflation Theory proposes a period of extremely rapid (exponential) expansion of the universe during its first few moments.
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