The classical field created in early stages of high energy nucleus-nucleus collisions

Understand

We show that a special choice of light-cone gauge can greatly simplify the calculation of the classical color field created in the initial stages of nucleus-nucleus collisions.

• Within this gauge, we can in particular construct explicitly the conserved color current and calculate exactly the gauge field immediately after the collision.
• This field is used as a boundary condition in an iterative solution of the Yang-Mills equations in the forward light-cone.
• In leading order, which corresponds to a linearization of the Yang-Mills equation in the forward light-cone, we obtain a simple formula for the spectrum of gluons produced in nucleus-nucleus collisions.