content_image/304554.jpg content_image/304553.jpg content_image/304552.jpg
<img src='content_image/304554.jpg'>

In order for this and Eq. (4.165) to both be satisfied, we require the lower bound in Eq. (4.192) to be much smaller than the upper bound in Eq. (4.165). This gives 

<img src='content_image/304553.jpg'>

We now require the lower bound here to be much smaller than the upper bound in Eq. (4.166). This gives 

<img src='content_image/304552.jpg'>

where we have explicitly factored out the 1 (2 n +4)! term from our definition of λ . Given that n ≥ 1 , this constraint is in conflict with the requirement that λ ≲ 1 . Therefore, for α ̸ = 1 , we find that the “end of inflation” mecha- 

