Weakly Nonlocal Hydrodynamics and the Origin of Viscosity in the Adhesion Model

Details Weakly Nonlocal Hydrodynamics and the Origin of Viscosity in the Adhesion Model Weakly Nonlocal Hydrodynamics and the Origin of Viscosity in the Adhesion Model

2005-02-28

arxiv.org/abs/astro-ph/0502580v1

Phys.Rev. D71 (2005) 067302

Astronomy and Astrophysics

Astrophysics

5 pages. Accepted for publication in Physical Review D

Scientific paper

10.1103/PhysRevD.71.067302

We use the weakly nonlocal hydrodynamics approach to obtain a dynamical equation for the peculiar velocity field in which the viscosity term is physically motivated. Based on some properties of the Ginzburg-Landau equation and the wave mechanics analog of hydrodynamics we find the nonlocal adhesion approximation taking into account the internal structures of the Zeldovich pancakes. If the internal structures correspond to significant mesoscopic fluctuations, viscosity is probably driven by a stochastic force and dynamics is given by the noisy Burgers equation.

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