String Theory seminar - Zachary Kenton Seminar

Soft limits of inflationary correlation functions are sensitive to the number of light fields during inflation. I will begin with the calculation of the soft (squeezed) limit of the bispectrum in multifield inflation. I will then discuss the soft limits of the trispectrum and higher n-point functions. I'll show novel relations and inequalities between soft limits of n-point functions and soft limits of lower-point functions. We apply our results to observational probes and compare our results with previous formulae, finding a 20% theoretical correction to observable parameters for squeezings relevant to future cosmological experiments. This work is based on our paper arXiv:1507.08629 and work soon to appear.