12-117 Mikko Stenlund

A vector-valued almost sure invariance principle for Sinai billiards with random scatterers (885K, pdf) Oct 4, 12

Abstract , Paper (src), View paper (auto. generated pdf), Index of related papers

Abstract. Understanding the statistical properties of the aperiodic planar Lorentz gas stands as a grand challenge in the theory of dynamical systems. Here we study a greatly simplified but related model, proposed by Arvind Ayyer and popularized by Joel Lebowitz, in which a scatterer configuration on the torus is randomly updated between collisions. Taking advantage of recent progress in the theory of time-dependent billiards on the one hand and in probability theory on the other, we prove a vector-valued almost sure invariance principle for the model. Notably, the configuration sequence can be weakly dependent and non-stationary. We provide an expression for the covariance matrix, which in the non-stationary case differs from the traditional one. We also obtain a new invariance principle for Sinai billiards (the case of fixed scatterers) with time-dependent observables, and improve the accuracy and generality of existing results.

Files: 12-117.src( 12-117.comments , 12-117.keywords , RB_6.00.pdf.mm )