Accurate Predictions for the Scale-Dependent Galaxy Bias from Primordial Non-Gaussianity

TL;DR

This paper improves theoretical predictions of galaxy bias influenced by primordial non-Gaussianity, aligning them with simulations, and enabling more precise constraints on early universe physics from galaxy surveys.

Contribution

It introduces a crucial correction to the galaxy bias model, enhancing the accuracy of predictions related to primordial non-Gaussianity.

Findings

New bias predictions match N-body simulations.

Previous models underestimated the bias correction.

Refined models improve constraints on primordial physics.

Abstract

The large-scale clustering of galaxies can serve as a probe of primordial non-Gaussianity in the Universe competitive with the anisotropies of the CMB. Here, we present improved theoretical predictions which include an important, previously overlooked correction to the bias. We demonstrate that the new predictions are able to reproduce the results of N-body simulations, explaining the significant departures seen from previous theoretical results. These refined predictions open the way to accurate constraints on primordial physics with large-scale structure surveys.