凤凰宇宙的回归
The Return of the Phoenix Universe
摘要：
乔治·勒梅特（Georges Lemaitre）引入了“凤凰宇宙”一词，用来描述一种具有交替周期的引力坍缩和膨胀的振荡宇宙学。这个模型在观测上被排除了，因为它需要超临界的质量密度，并且不能容纳暗能量。然而，一种新的宇宙循环理论已经提出，回避了这些问题。在最近对这幅图景的阐述中，几乎今天观测到的整个宇宙都注定要被困在黑洞中，但一个微小的区域将像凤凰一样从这些灰烬中出现，形成一个更大的光滑平坦的宇宙，充满星系、恒星、行星，而且可能还有生命。生存关键取决于暗能量，并提出了一个原因，为什么它的密度是小和积极的今天。
英文摘要：
Georges Lemaitre introduced the term "phoenix universe" to describe an oscillatory cosmology with alternating periods of gravitational collapse and expansion. This model is ruled out observationally because it requires a supercritical mass density and cannot accommodate dark energy. However, a new cyclic theory of the universe has been proposed that evades these problems. In a recent elaboration of this picture, almost the entire universe observed today is fated to become entrapped inside black holes, but a tiny region will emerge from these ashes like a phoenix to form an even larger smooth, flat universe filled with galaxies, stars, planets, and, presumably, life. Survival depends crucially on dark energy and suggests a reason why its density is small and positive today.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
