Longitudinal Coherence in a Holographic Model of p-Pb Collisions

Abstract

As a model of the longitudinal structure in heavy ion collisions, we simulate gravitational shock wave collisions in anti-de Sitter space in which each shock is composed of multiple constituents. We find that all constituents act coherently, and their separation leaves no imprint on the resulting plasma, when this separation is $\lesssim 0.26/T_{hyd}$, with $T_{hyd}$ the temperature of the plasma at the time when hydrodynamics first becomes applicable. In particular, the center-of-mass of the plasma coincides with the center-of-mass of all the constituents participating in the collision, as opposed to the center-of-mass of the individual collisions. We discuss the implications for nucleus-nucleus and proton-nucleus collisions.

5 pages, 3 figures. v2 matches published version

References in corpus (3)

• Holography and colliding gravitational shock waves in asymptotically AdS_5 spacetime
• CGC predictions for p+Pb collisions at the LHC
• Longitudinal fluctuations of the fireball density in heavy-ion collisions

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