论文标题
通货膨胀期间重力波的规模不变
Scale-invariant enhancement of gravitational waves during inflation
论文作者
论文摘要
计算了来自激发的观众标量场的通货膨胀1循环张量功率谱。关于原始黑洞的最新研究表明，在小尺度上，通货膨胀曲率扰动可能很大。增强的曲率扰动可能是由于观众标量场波动的急剧增强而引起的。在这封信中，使用形式上的形式主义，我们通过这种激发的观众场在动量空间中尖锐的峰值计算1循环的量子校正对原始引力波。我们在此完整的量子设置中找到了比例不变的环校正，与先前计算的标量诱导的张量模式中的峰值校正相反。特别是，在超级哈勃尺度上，还放大了原始引力波，这可以理解为由于激发标量场而导致的真空的Bogolyubov转换。这种机制使我们能够在极短距离尺度上探测标量场特性，并具有当前和未来的宇宙微波背景和重力波实验，为通货膨胀宇宙学打开了新的窗口。
The inflationary 1-loop tensor power spectrum from an excited spectator scalar field is calculated. Recent studies on primordial black holes suggest that the inflationary curvature perturbation may be huge on small scales. An enhanced curvature perturbation may arise from a drastic enhancement of spectator scalar field fluctuations. In this letter, using the in-in formalism, we calculate 1-loop quantum corrections to primordial gravitational waves by such an excited spectator field with a sharp peak in momentum space. We find scale-invariant loop corrections in this full quantum setup, in contrast to the sharply peaked corrections in the previously calculated scalar-induced tensor modes. Especially, on super Hubble scales, the primordial gravitational waves are also amplified, which can be understood as a Bogolyubov transformation of the vacuum due to the excited scalar field. This mechanism allows us to probe the scalar field properties on extremely short-distance scales with the current and future cosmic microwave background and gravitational wave experiments, opening a novel window for inflationary cosmology.
