论文标题
Axion-U（1）通胀的晶格模拟
Lattice Simulations of Axion-U(1) Inflation
论文作者
论文摘要
我们介绍了在通货膨胀过程中耦合到U（1）量规场的轴向场的第一个非线性晶格模拟。我们使用它来充分表征原始曲率扰动ζ的统计数据。我们发现高阶统计在描述该理论的线性状态中的非高斯量子时至关重要。相反，当动力学变为非线性时，非高斯性被抑制。这是由于原始黑洞过量生产而放松的边界，从而使脉冲星时阵列和干涉仪尺度上可观察到的引力波信号。我们的工作建立了晶格模拟，是研究通货膨胀时期及其预测的关键工具。
We present the first nonlinear lattice simulation of an axion field coupled to a U(1) gauge field during inflation. We use it to fully characterize the statistics of the primordial curvature perturbation ζ. We find high-order statistics to be essential in describing non-Gaussianity of ζ in the linear regime of the theory. On the contrary, non-Gaussianity is suppressed when the dynamics becomes nonlinear. This relaxes bounds from overproduction of primordial black holes, allowing for an observable gravitational waves signal at pulsar timing array and interferometers scales. Our work establishes lattice simulations as a crucial tool to study the inflationary epoch and its predictions.
