Detectability of the effect of Inflationary non-Gaussianity on halo bias

TL;DR

This paper investigates how different types of primordial non-Gaussianity affect large-scale halo bias, demonstrating its potential to detect subtle signals from horizon-scale effects and distinguish among inflationary models.

Contribution

It provides a comprehensive analysis of halo bias sensitivity to various non-Gaussianity types, including horizon-scale GR corrections, enhancing methods to probe early universe physics.

Findings

Large-scale halo bias is highly sensitive to non-Gaussianity.

Potential detection of horizon-scale GR corrections with future surveys.

Halo bias can discriminate among different inflationary models.

Abstract

We consider the description of the clustering of halos for physically-motivated types of non-Gaussian initial conditions. In particular we include non-Gaussianity of the type arising from single field slow-roll, multi fields, curvaton (local type), higher-order derivative-type (equilateral), vacuum-state modifications (enfolded-type) and horizon-scale GR corrections type. We show that large-scale halo bias is a very sensitive tool to probe non-Gaussianity, potentially leading, for some planned surveys, to a detection of non-Gaussianity arising from horizon-scale GR corrections. In tandem with cosmic microwave background constraints, the halo-bias approach can help enormously to discriminate among different shapes of non-Gaussianity and thus among models for the origin of cosmological perturbations.