Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2010-03-26
Journal of Statistical Mechanics: Theory and Experiment 2010, 08 (2010) P08021
Physics
Condensed Matter
Statistical Mechanics
40 pages
Scientific paper
10.1088/1742-5468/2010/08/P08021
We discuss invariant measures of partial differential equations such as the 2D Euler or Vlasov equations. For the 2D Euler equations, starting from the Liouville theorem, valid for N-dimensional approximations of the dynamics, we define the microcanonical measure as a limit measure where N goes to infinity. When only the energy and enstrophy invariants are taken into account, we give an explicit computation to prove the following result: the microcanonical measure is actually a Young measure corresponding to the maximization of a mean-field entropy. We explain why this result remains true for more general microcanonical measures, when all the dynamical invariants are taken into account. We give an explicit proof that these microcanonical measures are invariant measures for the dynamics of the 2D Euler equations. We describe a more general set of invariant measures, and discuss briefly their stability and their consequence for the ergodicity of the 2D Euler equations. The extension of these results to the Vlasov equations is also discussed, together with a proof of the uniqueness of statistical equilibria, for Vlasov equations with repulsive convex potentials. Even if we consider, in this paper, invariant measures only for Hamiltonian equations, with no fluxes of conserved quantities, we think this work is an important step towards the description of non-equilibrium invariant measures with fluxes.
Bouchet Freddy
Corvellec Marianne
No associations
LandOfFree
Invariant measures of the 2D Euler and Vlasov equations does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Invariant measures of the 2D Euler and Vlasov equations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Invariant measures of the 2D Euler and Vlasov equations will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-182125