标题： 引力波与大场暴胀 显示英文标题

标题： Gravitational waves and large field inflation

摘要： 根据著名的Lyth界限，通过找到具有足够大的张量-标量比$r$的张量模可以确认大场膨胀。在这里，我们将尝试回答两个相关的问题：是否可以通过找不到张量模$r$超过某个临界值来排除所有大场膨胀模型？通过测量$r$，我们能对膨胀尺度说些什么？然而，为了回答这些问题，应该区分两种不同定义的大场膨胀和三种不同的膨胀尺度定义。我们将使用宇宙学$\alpha$-吸引子理论作为一个方便的试验场来研究这些问题。 显示英文摘要

摘要： According to the famous Lyth bound, one can confirm large field inflation by finding tensor modes with sufficiently large tensor-to-scalar ratio $r$. Here we will try to answer two related questions: Is it possible to rule out all large field inflationary models by not finding tensor modes with $r$ above some critical value, and what can we say about the scale of inflation by measuring $r$? However, in order to answer these questions one should distinguish between two different definitions of the large field inflation and three different definitions of the scale of inflation. We will examine these issues using the theory of cosmological $\alpha$-attractors as a convenient testing ground.