We study the effects of a massive field with a continuous spectrum (continuum isocurvaton)
on the inflationary bispectrum in the squeezed limit. As a concrete example, we extend the …

A bstract Massive fields can imprint unique oscillatory features on primordial correlation
functions or inflationary correlators, which is dubbed the cosmological collider signal. In this …

A bstract Cosmological colliders can preserve information from interactions at very high
energy scale, and imprint them on cosmological observables. Taking the squeezed limit of …

A bstract We study effects of multiple scalar fields (scalar isocurvatons) with the Hubble
scale masses on the inflationary bispectrum in the squeezed limit, particular paying attention …

A bstract We derive a cutting rule for equal-time in-in correlators including cosmological
correlators based on Keldysh r/a basis, which decomposes diagrams into fully retarded …

A bstract We discuss two possible scenarios, namely the curvaton mechanism and the dark
matter density modulation, where non-Gaussianity signals of superheavy dark matter …

A bstract Within the so-called cosmological collider program, imprints of new particles on
primordial non-Gaussianities have been studied intensively. In particular, their non-analytic …

Heavy fields of Hubble scale order present during inflation contribute to the non-Gaussian
signature for the three-point function of the inflaton. Taking into account that Hubble scale is …

We study the non-Gaussianities in quasi-single field inflation with a warm inflation
background. The thermal effects at small scales can sufficiently enhance the magnitude of …

We study the effective field theory (EFT) description of the virtual particle effects in quasi-
single field inflation, which unifies the previous results on large mass and large mixing …