论文标题
突然制动并带有两场电势颠簸：原始黑洞形成
Sudden braking and turning with a two-field potential bump: primordial black hole formation
论文作者
论文摘要
我们研究了具有高斯电势颠簸的两体膨胀模型中曲率扰动的扩增。当充气板沿通货膨胀轨迹遇到潜在的颠簸时，其滚动速度通常会降低，可能导致违反慢速滚动条件。因此，在缓慢滚动期开始增长的原始腐烂曲率扰动的模式，并导致小规模密度扰动增强，这些密度扰动可以产生大量原始黑洞（PBH）和相关标量诱导的重力波。此外，在高斯电势颠簸相遇时，Intraton还会突然转折，由于这些转弯的持续时间很短，因此对总体曲率功率谱微不足道。我们的论文提供了一个简单的示例，说明了单场通货膨胀中PBH形成的颠簸样潜力扩展到两场案例，这有助于减轻初始条件的微调。
We investigate the amplification of curvature perturbations in a two-field inflation model featuring a Gaussian potential bump. When the inflaton encounters a potential bump along the inflationary trajectory, its rolling speed is generally reduced, potentially causing a violation of the slow-roll condition. Consequently, the original decaying modes of comoving curvature perturbations during the slow-roll phase start growing, and lead to enhanced small-scale density perturbations which can produce amounts of primordial black holes (PBHs) and associated scalar-induced gravitational waves. In addition, inflaton also undergoes sudden turnings at the encounter of the Gaussian potential bump, which is insignificant to the overall curvature power spectrum due to the short duration of these turns. Our paper offers a simple example of the extension of a bump-like potential for PBH formation in a single-field inflation to a two-field case, which helps alleviate the fine-tuning of initial conditions to some extent.
