# Nuclear Theory/RIKEN seminar

## "Hydrodynamics Beyond the Gradient Expansion: Resurgence and Resummation"

#### Presented by Michael Heller, Perimeter Institute

Friday, April 10, 2015, 2:00 pm — Small Seminar Room, Bldg. 510

Consistent formulations of relativistic viscous hydrodynamics involve short lived modes, leading to asymptotic rather than convergent gradient expansions. In this talk I will consider the Mueller-Israel-Stewart theory applied to a longitudinally expanding quark-gluon plasma system and identify hydrodynamics as a universal attractor without invoking the gradient expansion. I will give strong evidence for the existence of this attractor and then show that it can be recovered from the divergent gradient expansion by Borel summation. This requires careful accounting for the short-lived modes which leads to an intricate mathematical structure known from the theory of resurgence.

Hosted by: Soeren Schlichting

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