Hierarchical clustering and the BAO signature

TL;DR

This paper investigates how non-linear evolution affects the BAO signal in higher-order statistics of the cosmic density field, showing that while amplitudes change, the scale remains stable, indicating potential for improved cosmological probes.

Contribution

It demonstrates that higher-order correlation amplitudes can serve as effective probes of the BAO scale despite non-linear effects.

Findings

Non-linear evolution alters BAO amplitudes

BAO scale remains unaffected by non-linearities

Higher-order correlations enhance BAO signal detection

Abstract

In this contribution we present the preliminary results regarding the non-linear BAO signal in higher-order statistics of the cosmic density field. We use ensembles of N-body simulations to show that the non-linear evolution changes the amplitudes of the BAO signal, but has a negligible effect on the scale of the BAO feature. The latter observation accompanied by the fact that the BAO feature amplitude roughly doubles as one moves to higher orders, suggests that the higher-order correlation amplitudes can be used as probe of the BAO signal.