Quantum chaos in the perfect fluid: spectrum of initial fluctuations in the little bang

TL;DR

This paper explores how quantum fluctuations decohere classical fields in heavy ion collisions, influencing the equation of state and hydrodynamics, with numerical evidence showing low viscosity ratios in a scalar theory.

Contribution

It introduces a framework for understanding quantum fluctuation decoherence in heavy ion collisions and demonstrates low viscosity ratios through scalar field simulations.

Findings

Quantum fluctuations decohere classical fields in heavy ion collisions.

The framework predicts an equation of state consistent with hydrodynamics.

Numerical results show anomalously low η/s values in scalar theory.

Abstract

We outline how unstable quantum fluctuations decohere classical fields in heavy ion collisions, leading to an equation of state and hydrodynamics. Explicit numerical realization of this framework in a scalar $\phi^4$ theory demonstrates that anomalously low values of $\eta/s$ can be generated.