On the Boltzmann-Grad limit for the two dimensional periodic Lorentz gas

Details On the Boltzmann-Grad limit for the two dimensional periodic Lorentz gas On the Boltzmann-Grad limit for the two dimensional periodic Lorentz gas

2010-02-07

arxiv.org/abs/1002.1463v3

Mathematics

Analysis of PDEs

43 pages, 3 figures, revised version accepted for publication in the Journal of Statistical Physics

Scientific paper

10.1007/s10955-010-0046-1

The two-dimensional, periodic Lorentz gas, is the dynamical system corresponding with the free motion of a point particle in a planar system of fixed circular obstacles centered at the vertices of a square lattice in the Euclidian plane. Assuming elastic collisions between the particle and the obstacles, this dynamical system is studied in the Boltzmann-Grad limit, assuming that the obstacle radius $r$ and the reciprocal mean free path are asymptotically equivalent small quantities, and that the particle's distribution function is slowly varying in the space variable. In this limit, the periodic Lorentz gas cannot be described by a linear Boltzmann equation (see [F. Golse, Ann. Fac. Sci. Toulouse 17 (2008), 735--749]), but involves an integro-differential equation conjectured in [E. Caglioti, F. Golse, C.R. Acad. Sci. S\'er. I Math. 346 (2008) 477--482] and proved in [J. Marklof, A. Str\"ombergsson, preprint arXiv:0801.0612], set on a phase-space larger than the usual single-particle phase-space. The main purpose of the present paper is to study the dynamical properties of this integro-differential equation: identifying its equilibrium states, proving a H Theorem and discussing the speed of approach to equilibrium in the long time limit. In the first part of the paper, we derive the explicit formula for a transition probability appearing in that equation following the method sketched in [E. Caglioti, F. Golse, loc. cit.].

Affiliated with

Also associated with

No associations

Rating

On the Boltzmann-Grad limit for the two dimensional periodic Lorentz gas 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 On the Boltzmann-Grad limit for the two dimensional periodic Lorentz gas, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On the Boltzmann-Grad limit for the two dimensional periodic Lorentz gas will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-582772