May 13 – 19, 2018
Venice, Italy
Europe/Zurich timezone
The organisers warmly thank all participants for such a lively QM2018! See you in China in 2019!

Decoherence and von Neumann entropy production of classical Yang-Mills fields in relativistic heavy ion collisions

May 15, 2018, 5:00 PM
2h 40m
First floor and third floor (Palazzo del Casinò)

First floor and third floor

Palazzo del Casinò

Poster Initial state physics and approach to equilibrium Poster Session


Hidefumi Matsuda (kyoto university)


In the early stage of relativistic heavy-ion collisions, coherent and anisotropic classical Yang-Mills field emerges.
This field, referred to as glasma, has several instabilities from the anisotropy, so small fluctuations in glasma grow exponentially.
Glasma is also known to have chaoticity, which make the field configuration complex and produces the entropy.
Instability and chaoticity of glasma rapidly drive the pressure isotropization and are expected to cause thermalization.
In this work, we compare the time scale of the entropy production and the pressure isotropization in the classical Yang-Mills field.
We regard the classical field as a coherent state, and evaluate the quantum entropy (von Neuman entropy) obtained by ignoring the off-diagonal density matrix elements, namely decoherence.
We find that the growth of fluctuations cause entropy production and pressure isotropization in the same time scale.
We also discuss how the classical Yang-Mills field loses coherence as a result of time average of the density matrix.

Content type Theory
Centralised submission by Collaboration Presenter name already specified

Primary authors

Hidefumi Matsuda (kyoto university) Prof. Akira Ohnishi (Yukawa Institute, Kyoto University) Teiji Kunihiro (Kyoto University) Prof. Toru T. Takahashi (Gunma National College of Technology) Hideaki Iida (Kyoto University) Mr Hidekazu Tsukiji (Yukawa Institute, Kyoto University)

Presentation materials