Large non-Gaussian Halo Bias from Single Field Inflation

TL;DR

This paper investigates how non-Gaussian initial states in single field inflation can produce significant, observable non-Gaussian effects in large-scale structure, especially affecting halo bias with strong scale dependence.

Contribution

It introduces a new calculation of large-scale structure observables for non-Gaussianity from non-Bunch-Davies initial states, highlighting their potential for observable signatures.

Findings

Non-Gaussianity from non-Bunch-Davies states can produce a strongly scale-dependent halo bias.

Such non-Gaussian effects may be more prominent than those from the local ansatz.

The paper discusses the theoretical conditions needed to generate observable non-Gaussian signatures.

Abstract

We calculate Large Scale Structure observables for non-Gaussianity arising from non-Bunch-Davies initial states in single field inflation. These scenarios can have substantial primordial non-Gaussianity from squeezed (but observable) momentum configurations. They generate a term in the halo bias that may be more strongly scale-dependent than the contribution from the local ansatz. We also discuss theoretical considerations required to generate an observable signature.