论文标题
轴心通货膨胀的不稳定性，并从仪表模式下进行强反射
Instability in axion inflation with strong backreaction from gauge modes
论文作者
论文摘要
我们对模型背景解决方案的稳定性进行了分析研究，在该研究通过轴子耦合到$ u（1）$量规场，充气量会导致仪表场模式的放大，从而在其动力学上强烈反应。为了实现这一目标，我们研究了量规场模式的演变，耦合到零模式，从而触及对充气速度的偏差与其平均场值的偏差进行处理。只要系统处于强烈的反应状态，我们发现，充气速度的振荡振幅增加了其在恒定速度近似值中所具有的价值的振幅，从而证实了在数值研究中已经观察到的不稳定。
We perform an analytical study of the stability of the background solution of the model in which an inflaton, through an axionic coupling to a $U(1)$ gauge field, causes an amplification of the gauge field modes that strongly backreact on its dynamics. To this goal, we study the evolution of the gauge field modes coupled to the inflaton zero mode, treating perturbatively the deviation of the inflaton velocity from its mean-field value. As long as the system is in the strong backreaction regime we find that the inflaton velocity performs oscillations of increasing amplitude about the value it would have in the approximation of constant velocity, confirming an instability that has been observed in numerical studies.
