通过电磁耗散在陡势上自然膨胀
Naturally inflating on steep potentials through electromagnetic dissipation
摘要：
在自然暴胀模型中，暴胀子是一种类似轴子的粒子。不幸的是，在UV完备理论中的轴子势似乎太陡，无法驱动暴胀。我们表明，即使是一个陡峭的潜力，自然暴胀可以发生，如果轴子和规范场之间的耦合考虑。由于这种耦合，规范场的量子由轴子的滚动产生。如果耦合足够大，这种耗散效应会减慢轴子的速度，甚至在陡峭的电势下也会导致膨胀。扰动谱是准尺度不变的，但在最简单的结构中，其振幅大于$10^{-5}$。我们讨论解决这个问题的一种可能的方法。
英文摘要：
In models of natural inflation, the inflaton is an axion-like particle. Unfortunately, axion potentials in UV-complete theories appear to be too steep to drive inflation. We show that, even for a steep potential, natural inflation can occur if the coupling between axion and gauge fields is taken into account. Due to this coupling, quanta of the gauge field are produced by the rolling of the axion. If the coupling is large enough, such a dissipative effect slows down the axion, leading to inflation even for a steep potential. The spectrum of perturbations is quasi-scale invariant, but in the simplest construction its amplitude is larger than $10^{-5}$. We discuss a possible way out of this problem.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
