Strongly Scale-dependent Non-Gaussianity

TL;DR

This paper explores models of primordial density perturbations with non-Gaussianity that varies strongly with scale, being suppressed on large scales but significant on small scales, affecting cosmological observations.

Contribution

It introduces scale-dependent non-Gaussianity models with sharp cut-offs, highlighting their potential impact on cosmological measurements.

Findings

Non-Gaussianity can be strongly suppressed on large scales.

Models exhibit a sharp cut-off in non-Gaussianity at certain scales.

Implications for large-scale structure and CMB anisotropy probes.

Abstract

We discuss models of primordial density perturbations where the non-Gaussianity is strongly scale-dependent. In particular, the non-Gaussianity may have a sharp cut-off and be very suppressed on large cosmological scales, but sizeable on small scales. This may have an impact on probes of non-Gaussianity in the large-scale structure and in the cosmic microwave background radiation anisotropies.