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!

Causality as a bound to fluid dynamics

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 Collective dynamics Poster Session


Eduardo Grossi (Heidelberg University)


Dissipative relativistic fluid dynamics is not always causal. We discuss the causality structure of high energy nuclear collisions. When the fluid evolution equations are hyperbolic, one can bring them to a characteristic form describing the radial expansion of the fireball. This dynamics is causal if the characteristic velocities are smaller than the speed of light such that the domain of dependence of a space-time point is within its past light cone. Within the second order theory of Denicol, Niemi, Molnar and Rischke, we obtain a concrete inequality from this constraint and discuss how it can be violated for certain initial conditions sometimes used in phenomenological studies. We argue that causality poses an important bound to the applicability of relativistic fluid dynamics in particular at very early times.

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Content type Theory

Primary author

Eduardo Grossi (Heidelberg University)


Stefan Floerchinger (Heidelberg University)

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