Resolving the Inflationary Power Spectrum
  Recently there have been differing viewpoints on how to evaluate the
curvature power spectrum generated during inflation. In a series of papers by
some authors it has been argued that the renormalization scheme adopted for the
inflaton field phi(x) to make <phi^2(x)> finite should also be applied to
|phi_k|^2. But this then modifies the curvature power spectrum in a non-trivial
way. On the other hand, others have criticized this approach and suggested
alternatives, which have been further countered by the original authors. We
discuss these differing viewpoints and indicate inconsistencies in both
approaches. We then resolve the issue by showing why the standard expression,
without any non-trivial regularization, is still valid.
