Event Details

Primordial non-Gaussianities, if observed, would constrain the field content and interactions present during the inflationary era. In this talk, we study the primordial non-Gaussianities produced in quasi-single field inflation (QSFI), one of the simplest extensions of single-field inflation. QSFI posits the existence of extra massive scalars, known as “isocurvatons”, whose interactions with the inflaton induce primordial nonGaussianities. We will see that their shapes depend strongly on the number of isocurvatons present in the QSFI theory and their masses relative to the inflationary Hubble constant. If the masses are much smaller than the Hubble constant then the inflaton squeezed bispectra and compressed trispectra can become very large and enhance the correlation functions of biased tracers of the matter over-density evaluated today. I will comment on the potential of upcoming large scale structure surveys, such as SPHEREx, of measuring these enhancements given current CMB constraints on primordial non-Gaussianities.