Speaker
Prof.
Giorgio Torrieri
(IFGW Unicamp)
Description
We discuss the zero-viscosity limit of fluid dynamics in the presence of microscopic thermal fluctuations. The interplay between these fluctuations and the generally non-linear evolution of fluid flow makes the existence of a well-defined hydrostatic limit ambiguous.
We investigate these issues taking microscopic thermal perturbations into account non-perturbatively via lattice field theory techniques, where their effect is absorbed into the functional integral.
We find intriguing evidence, that the vacuum of such a theory is non-trivial, casting doubts on whether the gradient expansion can provide a good effective field theory for this type of system. The non-trivial vacuum looks like a "turbulent" state where some of the entropy is carried by macroscopic degrees of freedom. We describe further steps to strengthen or falsify this evidence, and conclude with a discussion of the role of these issues in the "perfect fluid" phenomenology of heavy ion collisions.
Based on http://arxiv.org/abs/1502.05421
| On behalf of collaboration: | NONE |
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Author
Prof.
Giorgio Torrieri
(IFGW Unicamp)
Co-author
Dr
Tommy Burch
(Regensburg)
