New constraints on primordial features from the galaxy two-point correlation function

TL;DR

This paper investigates primordial features in the early Universe's density perturbations by analyzing galaxy correlation data, setting constraints comparable to Planck CMB measurements.

Contribution

It introduces the first analysis of primordial feature templates using galaxy two-point correlation functions, providing new constraints on their amplitudes.

Findings

Constraints on feature amplitudes are at most a few percent.

Results are competitive with Planck DR3 constraints.

First application of galaxy correlation data to primordial feature searches.

Abstract

Features in the primordial power spectrum represent the imprinted signal in the density perturbations of the physics and evolution of the early Universe. A measurement of such signals will represents the need to go beyond the minimal assumption made for the initial conditions of the cosmological perturbations. For the first time, we study different templates with undamped oscillations or a bump from the two-point correlation function measured from BOSS DR12 galaxies constraining the amplitude of the features to be at most a few percent. Constraints are competitive to the ones obtained with {\em Planck} DR3.