I will review recent progress to understand the generation of non-Gaussianity (NG) in the distribution of primordial curvature perturbations (those responsible for the cosmic microwave background (CMB) anisotropies and our universe's large scale structure (LSS)). I will show that in multi-field models of inflation, the quantum fluctuations of fields other than the inflaton may have probed the full structure of the inflationary landscape potential, inducing a type of local NG that cannot be fully characterized by 3- or 4-point correlation functions. I will discuss various strategies (beyond standard polyspectra) to search for this novel class of primordial NG with the help of future cosmological data.

連絡教員　物理学系　山口昌英（内線2385）