论文标题
非发挥ekpyrotic宇宙学具有近乎规模的宇宙扰动和重力波的频谱
Nonsingular Ekpyrotic Cosmology with a Nearly Scale-Invariant Spectrum of Cosmological Perturbations and Gravitational Waves
论文作者
论文摘要
我们提出了一种从字符串理论中借来的机制，该机制从ekpyrato收缩阶段到标准大爆炸宇宙学的扩展阶段产生了非单明性转变。相同的机制将宇宙学波动的初始真空谱转换为量表不变的机制，并将引力波的光谱更改为几乎尺度不变的频谱。标量和张量的倾斜度预计是相同的，与“弦气宇宙学”场景的预测相反。重力波谱的幅度取决于弦乐量表与普朗克量表的比率，并且可能达到了即将进行的实验。
We propose a mechanism borrowed from string theory which yields a non-singular transition from a phase of Ekpyrotic contraction to the expanding phase of Standard Big Bang cosmology. The same mechanism converts the initial vacuum spectrum of cosmological fluctuations before the bounce into a scale-invariant one, and also changes the spectrum of gravitational waves into an almost scale-invariant one. The scalar and tensor tilts are predicted to be the same, in contrast to the predictions from the "String Gas Cosmology" scenario. The amplitude of the gravitational wave spectrum depends on the ratio of the string scale to the Planck scale and may be in reach of upcoming experiments.
