论文标题
弹跳宇宙学的宇宙学扰动和前爆炸场景的情况
Cosmological perturbations in bouncing cosmologies and the case of the Pre-Big Bang scenario
论文作者
论文摘要
前几只爆炸宇宙学启发了几代宇宙学家，试图使用弦理论提出的基本长度尺度来治愈最初的大爆炸奇异性。已经提出，随着曲率的增加，已经提出了一个倒塌/通胀的阶段，随后是宇宙反弹的，是在地平线和曲率问题的溶液中替代标准膨胀的一种替代方法。但是，摄动的几乎规模不变的频谱的产生并不是这种情况的自动预测。在本文中，我回顾了一些关于弹跳宇宙学中扰动演变的一般性陈述，以及一些历史上重要的尝试，以使预测的光谱与观察结果调和。弹跳宇宙学，尤其是爆炸爆炸场景是可行的，尽管更复杂，但通货膨胀的替代方案仍可能有助于解决当前的理论和观察性张力。
The Pre-Big Bang cosmology inspired generations of cosmologists in attempts to cure the initial Big Bang singularity using a fundamental length scale as proposed by String Theory. The existence of a phase of collapse/inflation with increasing curvature followed by a cosmic bounce has been proposed as an alternative to standard inflation in the solution of the horizon and curvature problems. However the generation of a nearly scale-invariant spectrum of perturbations is not an automatic prediction of such scenarios. In this paper I review some general statements about the evolution of perturbations in bouncing cosmologies and some historically significant attempts to reconcile the predicted spectra with the observations. Bouncing cosmologies and in particular the Pre-Big Bang scenario stand as viable, although more complicated, alternatives to inflation that may still help solve current theoretical and observational tensions.
