Hydrodynamic Initial Conditions in Small Systems from Proton Phase-Space Entropy

TL;DR

This paper explores how to properly characterize the initial state in small collision systems like proton-proton collisions by using Wehrl-like entropy to connect quantum proton wave functions with classical hydrodynamics.

Contribution

It introduces a semi-classical entropy measure based on phase-space coarse-graining to match quantum proton states with hydrodynamic initial conditions.

Findings

Wehrl-like entropy effectively characterizes initial state microstates.

The approach bridges quantum descriptions and classical hydrodynamics.

Provides a framework for entropy deposition in small systems.

Abstract

The experimental observation of collective behaviour in proton-proton and proton-nucleus collisions poses a fundamental theoretical question regarding the proper characterization of the initial state underlying hydrodynamic evolution. While relativistic hydrodynamics requires an initial condition (IC) characterized by an entropy current, corresponding to a maximally mixed state, the microscopic description of the proton is based on inherently quantum objects, that are projections of pure states. We show that the appropriate matching between proton wave function and classical hydrodynamics emerges from the coarse-graining of its phase-space distribution quantified by the Wehrl-like entropy. This entropy provides a semi-classical, positive-definite measure of the density of accessible microstates at a given resolution scale, and therefore constitutes the appropriate quantity to characterize entropy deposition in small collision systems.