# Bunching, clustering, and the buildup of few-body correlations in a quenched unitary Bose gas

## TL;DR

This paper investigates how two- and three-body correlations develop over time in a quenched ultracold Bose gas at unitarity, revealing signatures of Efimov physics and the influence of atom-bunching effects on correlation growth.

## Contribution

It introduces a method linking many-body correlation dynamics with few-body models to map Efimov signatures during the evolution of a quenched Bose gas.

## Key findings

- Efimov signatures are observed as a function of evolution time.
- Atom-bunching enhances the growth of few-body correlations.
- Few-body correlations precede many-body effects on Fermi timescales.

## Abstract

We study the growth of two- and three-body correlations in an ultracold Bose gas quenched to unitarity. This is encoded in the dynamics of the two- and three-body contacts analyzed in this work. Via a set of relations connecting many-body correlations dynamics with few-body models, signatures of the Efimov effect are mapped out as a function of evolution time at unitarity over a range of atomic densities $n$. For the thermal resonantly interacting Bose gas, we find that atom-bunching leads to an enhanced growth of few-body correlations. These atom-bunching effects also highlight the interplay between few-body correlations that occurs before genuine many-body effects enter on Fermi timescales.