Statistical Mechanics and Fractals

This book is composed of two texts, by R.L. Dobrushin and S. Kusuoka, each representing the content of a course of lectures given by the authors. They are pitched at graduate student level and are thus very accessible introductions to their respective sub

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P.l.

Advisor: S. S. Chern, R-j. Jiang

1567

Lecture Notes in Mathematics Editors: A. Dold, Heidelberg R Eckmann, Zurich F. Takens, Groningen Subseries: Nankai Institute of Mathematics; Tianjin, China (vol. 10)

P.l.

Advisor: S. S. Chern, R-j. Jiang

1567

R.L. Dobrushin S. Kusuoka

Statistical Mechanics and Fractals

Springer-Verlag Berlin Heidelberg New York London Paris Tokyo Hong Kong Barcelona Budapest

Authors Roland Lvovich Dobrushin Institute for Problems of Information Transmission Ermolovoj 19 103051 Moscow, Russia Shigeo Kusuoka Research Institute of Mathematical Sciences Kyoto University 606 Kyoto, Japan New address: Department of Mathematical Sciences University of Tokyo 113 Tokyo, Japan

Mathematics Subject Classification (1991): 82BXX, 82B31, 60K35, 60160

ISBN 3-540-57516-2 Springer-Verlag Berlin Heidelberg New York ISBN 0-387-57516-2 Springer-Verlag New York Berlin Heidelberg This work is subject to copyright. All rights are reserved, whether the whole or part of the material is concerned, specifically the rights oftranslation, reprinting, re-use of illustrations, recitation, broadcasting, reproduction on microfilms or in any other way, and storage in data banks. Duplication of this publication or parts thereof is permitted only under the provisions of the German Copyright Law of September 9, 1965, in its current version, and permission for use must always be obtained from Springer- Verlag. Violations are liable for prosecution under the German Copyright Law. © Springer-Verlag Berlin Heidelberg 1993 Printed in Germany 2146/3140-543210 - Printed on acid-free paper

FOREWORD

The Nankai Institute of Mathematics held a special Year in Probability and Statistics during the academic year 1988­1989. We had over 150 specialists, professors and graduate students, who participated in this Special Year from August 1988 to May 1989. More than twenty outstanding probabilists and statisticians from several countries were invited to give lectures and talks. This volume contains two lectures, one is written by Professor R. L. Dobrushin, and the other one by Professor S. Kusuoka. We would like to express our gratitude to Professors Dobrushin and Kusuoka for their enthusiasm and cooperation.

Ze­Pei Jiang Shi­Jian Yan Ping Cheng Rong Wu

TABLE OF CONTENTS Part 1. On the Way to the Mathematical Foundations

Statistical Mechanics

by R. L. Dobrushin

§O. Introduction

1

§1. Realization of the Classical Fluid Model

5

§2. Dynamics of a Finite System

7

§3. Dynamics of an Infinite System

14

§4. Random Evolution

19

§5. Gibbsian States in Finite Volumes

21

§6. Gibbsian Measures in an Infinite Volume

26

§7. Random Evolution (revisited)

28

§8. Hydrodynamical Equations

31

References

36

Part 2. Diffusion Processes on Nested Fractals

by S. Kusuoka

Introduction

39

§1. Self-similar Fractal

41

§2. Nested fractals and their geometrical properties

47

§3. Transition probability of Markov chain

54

§4. Dirichlet form on nested fractal

62

§5. Probability measure induced by random matrices

72

§6. E