Turbulent fluctuations around Bjorken flow

Details Turbulent fluctuations around Bjorken flow Turbulent fluctuations around Bjorken flow

2011-06-26

arxiv.org/abs/1106.5227v1

Physics

Nuclear Physics

Nuclear Theory

4 pages, 2 figures - To appear in the conference proceedings for Quark Matter 2011, May 23 - May 28, Annecy, France

Scientific paper

We study the evolution of local event-by-event deviations from smooth average fluid dynamic fields, as they can arise in heavy ion collisions from the propagation of fluctuating initial conditions. Local fluctuations around Bjorken flow are found to be governed by non-linear equations whose solutions can be characterized qualitatively in terms of Reynolds numbers. Perturbations at different rapidities decouple quickly, and satisfy (after suitable coordinate transformations) an effectively two-dimensional Navier-Stokes equation of non-relativistic form. We discuss the conditions under which non-linearities in these equations cannot be neglected and turbulent behavior is expected to set in.

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