University of Minnesota
School of Physics & Astronomy

Nuclear Physics Seminar

Tuesday, November 20th 2018
11:15 am:
Nuclear Physics Seminar in Physics 301-20 Tate
Speaker: Mauricio Martinez Guerrero, North Caroline State University
Subject: Hydrodynamic Fluctuations and Lower Bounds of the Transport Coefficients

In this talk I will discuss the effects of hydrodynamic
fluctuations in non-relativistic and relativistic setups. Within the
framework of stochastic hydrodynamics I obtain a number of model
independent results, including the long-time tail of different
transport coefficients, and the leading non-analyticity of the
correlators of energy, momentum and particle density in
non-relativistic and relativistic setups. The presence of hydrodynamic
fluctuations induce lower bounds on the transport coefficients by
analyzing the low frequency limit of different correlation functions.
I determine the lower bounds of the bulk viscosity over entropy ratio
in a cold Fermi gas near unitarity. When extending this analysis to
the case of a U(1) conformal relativistic expanding fluid we observe
that the values of the shear viscosity and heat conductivity are
bounded from below. In both setups, non-relativistic and relativistic
one, the lower bounds on the transport coefficients are weakly
dependent on assumptions regarding the range of applicability of fluid
dynamics.

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