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!

Hydrodynamic fluctuations in relativistic heavy-ion collisions

May 15, 2018, 2:40 PM
Sala Perla, 1st Floor (Palazzo del Casinò)

Sala Perla, 1st Floor

Palazzo del Casinò

Parallel Talk Correlations and fluctuations Correlations and fluctuations


Mayank Singh (McGill University)


We present a novel approach to the treatment of thermal fluctuations in the (3+1)-D viscous hydrodynamic simulation MUSIC. We investigate the phenomenological impact of thermal fluctuations on hadronic and electromagnetic observables using the state-of-the-art IP-Glasma + hydrodynamics + hadronic cascade hybrid approach [1]. In particular, we show that these thermal fluctuations influence the result of elliptic and triangular flow measurements for ultra-central collisions, such as those presented by the CMS Collaboration [2]. Consequences on the extraction of QCD transport coefficients from heavy-ion collisions will also be discussed.

The anisotropic flow observed in heavy-ion collision experiments is mostly attributed to the hydrodynamic response to the event-by-event collision geometry and to the sub-nucleon quantum fluctuations. However, hydrodynamic fluctuations are present during the dynamical evolution of the Quark Gluon Plasma (QGP) and are quantified by the fluctuation-dissipation theorem [3]. They can leave their imprint on final-state observables.

By analyzing the thermal noise mode-by-mode, we provide a consistent scheme of treating these fluctuations as the source terms for hydrodynamic fields. These source terms are then evolved together with hydrodynamic equations of motion. Such a treatment captures the non-perturbative nature of the evolution for these thermal fluctuations.

[1] McDonald, S., Shen, C., Fillion-Gourdeau, F., Jeon, S. and Gale, C., Phys. Rev. C 95, 064913 (2017).

[2] The CMS collaboration, Chatrchyan, S., et al., JHEP (2014) 2014:88.

[3] Kapusta, J. I., Müller, B. and Stephanov, M., Phys. Rev. C 85, 054906 (2012).

Content type Theory
Centralised submission by Collaboration Presenter name already specified

Primary author

Mayank Singh (McGill University)


Dr Chun Shen (Brookhaven National Laboratory) Scott McDonald (McGill University) Sangyong Jeon (McGill University) Prof. Charles Gale (McGill University)

Presentation materials