Cyclic universe offers solutions to cosmological puzzles from "summary" of Endless Universe by Paul J. Steinhardt,Neil Turok
The idea of a cyclic universe is an intriguing one that has gained attention in the field of cosmology. Instead of a universe that has a definite beginning and end, the cyclic universe posits a never-ending cycle of birth, evolution, and death. This concept offers potential solutions to some of the most perplexing puzzles in cosmology. One of the main puzzles that a cyclic universe addresses is the problem of the Big Bang singularity. In a traditional cosmological model, the universe began from a singular point of infinite density and temperature. This singularity presents a challenge to our understanding of the laws of physics, as they break down under such extreme conditions. However, in a cyclic universe, there is no need for a singular beginning. Instead, the universe goes through cycles of expansion and contraction, avoiding the problematic singularity. Another cosmological puzzle that a cyclic universe can potentially resolve is the mystery of dark energy. Dark energy is a mysterious force that is causing the universe to expand at an accelerating rate. This has baffled scientists, as it goes against our current understanding of how gravity should be acting on the large-scale structure of the universe. In a cyclic universe, the effects of dark energy can be mitigated by the cycles of expansion and contraction, providing a natural explanation for this phenomenon. Furthermore, a cyclic universe offers a possible solution to the conundrum of the homogeneity and isotropy of the universe. The universe appears to be uniform and isotropic on large scales, which is difficult to explain in a standard cosmological model. However, in a cyclic universe, the cycles of expansion and contraction can smooth out any irregularities, leading to a more homogeneous and isotropic universe.- The concept of a cyclic universe presents a compelling alternative to traditional cosmological models. By addressing key puzzles such as the Big Bang singularity, dark energy, and the uniformity of the universe, a cyclic universe offers new insights into the nature of our cosmos. It challenges our understanding of the universe and opens up new possibilities for exploring the mysteries of the cosmos.
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