Limits on primordial non-Gaussianities from BOSS galaxy-clustering data

TL;DR

This paper uses BOSS galaxy data and Effective Field Theory to constrain primordial non-Gaussianities, providing limits on inflationary models through bispectrum analysis, with results comparable to WMAP.

Contribution

First application of EFT-based bispectrum analysis to BOSS data to constrain primordial non-Gaussianities with validated simulation methods.

Findings

Constraints on f_NL for equilateral, orthogonal, and local shapes.

Results comparable to WMAP constraints.

Validated analysis methodology against simulations.

Abstract

We analyze the power spectrum and the bispectrum of BOSS galaxy-clustering data using the prediction from the Effective Field Theory of Large-Scale Structure at one-loop order for $\textit{both}$ the power spectrum $\textit{and}$ the bispectrum. With $\Lambda$CDM parameters fixed to Planck preferred values, we set limits on three templates of non-Gaussianities predicted by many inflationary models: the equilateral, the orthogonal, and the local shapes. After validating our analysis against simulations, we find $f_{\rm NL}^{\rm equil.}= 207 \pm 292\, , f_{\rm NL}^{\rm orth.}= -68 \pm 73\, , f_{\rm NL}^{\rm loc.}= 52 \pm 34$, at $68\%$ confidence level. These bispectrum-based constraints from Large-Scale Structure, not far from the ones of WMAP, suggest promising results from upcoming surveys.