EAN: 9783319102856

SPRINGERBRIEFS IN PHYSICS TRANSPORT AND FLUCT...

This brief offers a concise presentation of granular fluids from the point of view of
non-equilibrium statistical physics. The emphasis is on fluctuations  which can be large in
granular fluids due to the small system size (the number of grains is many orders of magnitude
smaller than in molecular fluids).Firstly  readers will be introduced to the most intriguing
experiments on fluidized granular fluids. Then granular fluid theory  which goes through
increasing levels of coarse-graining and emerging collective phenomena  is described. Problems
and questions are initially posed at the level of kinetic theory  which describes particle
densities in full or reduced phase-space. Some answers become clear through hydrodynamics 
which describes the evolution of slowly evolving fields. Granular fluctuating hydrodynamics 
which builds a bridge to the most recent results in non-equilibrium statistical mechanics  is
also introduced. Further and more interesting answers come when the dynamics of a massive
intruder are discussed. Such non-equilibrium stochastic process offers a more precise and
compact picture of the features foreseen at the more detailed levels of description. The
dynamics of an intruder diffusing in a granular fluid reveal the clearest connection with
recent theories on stochastic energetics and stochastic thermodynamics.

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