Speaker
Yuko Urakawa
Description
Infrared divergences in inflationary correlators raise the question of what is observable during inflation. We formulate a locality condition on how the soft modes are attached to the hard sector — patch by patch on a super-horizon lattice — and show that it ensures the infrared regularity of inflationary perturbations, the soft theorems for the correlation functions, and the suppression of loop corrections. We close by commenting on the parallel with the infrared structure of QED, where the finiteness of the S-matrix is controlled by an analogous condition on the dressing of hard states.