Studying the 3+1D structure of the Glasma using the weak field approximation

TL;DR

This paper extends the weak field approximation for the Glasma beyond boost invariance, enabling the calculation of rapidity-dependent observables and revealing the role of longitudinal color correlations in the early stages of heavy-ion collisions.

Contribution

It introduces a method to compute rapidity-dependent observables in the Glasma using an extended weak field approximation beyond boost invariance.

Findings

Weak field approximation agrees with lattice simulations for small fields.

Rapidity profile of transverse pressure is influenced by longitudinal color correlations.

The approach allows studying early-time dynamics in heavy-ion collisions.

Abstract

We extend the weak field approximation for the Glasma beyond the boost-invariant approximation, which allows us to compute rapidity-dependent observables in the early stages of heavy-ion collisions. We show that in the limit of small fields, the weak field approximation agrees quantitatively with non-perturbative lattice simulations. Furthermore, we demonstrate that the rapidity profile of the transverse pressure is determined by longitudinal color correlations within the colliding nuclei.