Dimensions of average conformal repeller.doc
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1、http:/Dimensions of average conformal repellerJungchao BanDepartment of mathematics National Hualien University of Education Hualien 97003, Taiwan jcbanmail.nhlue.edu.twYongluo CaoDepartment of mathematicsSuzhou UniversitySuzhou 215006, Jiangsu, P.R.China , Abstract. In this paper, average conformal
2、 repeller is defined, which is generalization of conformal repeller. Using thermodynamic formalism for sub-additive potential defined in 5, Hausdorff dimension and box dimension of average conformal repellers are obtained. The map f is only needed C 1, without additional condition.Key words and phra
3、ses Hausdorff dimension, Non-conformal repellers, Topological pressure.1 Introduction.In the dimension theory of dynamical systems, and in particular in the study of the Hausdorff dimension of invariant sets of hyperbolic dynamics, the theory is only devel- oped to full satisfaction in the case of c
4、onformal dynamical systems (both invertible and non-invertible ). Roughly speaking, these are dynamical systems for which at each point the rate of contraction and expansion are the same in every direction. Bowen00 2000 Mathematics Subject classification: Primary 37D35; Secondary 37C45.133 was the f
5、irst to express the Hausdorff dimension of an invariant set as a solution of an equation involving topological pressure. Ruelle 13 refined Bowens method andobtained the following result. Assume that f is a C 1+ conformal expanding map, isan isolated compact invariant set and f | is topologically mix
6、ing, then the Hausdorff dimension of , dimH is given by the unique solution of the equationP (f | , log kDxf k) = 0(1.1)where P (f | , ) is the topological pressure functional. The smoothness C 1+ was re- cently relaxed to C 1 10.For non-conformal dynamical systems there exists only partial results.
7、 For example, the Hausdorff dimension of hyperbolic invariant sets was only computed in some specialcases. Hu 12 gave an estimate of dimension of non-conformal repeller for C 2 map.Falconer 7, 8 computed the Hausdorff dimension of a class of non-conformal repellers. Related ideas were applied by Sim
8、on and Solomyak 15 to compute the Hausdorffdimension of a class of non-conformal horseshoes in R3.For C 1 non-conformal repellers, in 17, the author uses singular values of the deriva-tive Dxf n for all n Z +, to define a new equation which involves the limit of a sequenceof topological pressure. Th
9、en he shows that the unique solution of the equation is anupper bounds of Hausdorff dimension of repeller. In 1, the same problem is con- sidered. The author bases on the non-additive thermodynamic formalism which wasintroduced in 2 and singular value of the derivative Dxf n for all n Z +, and gives
10、an upper bounds of box dimension of repeller under the additional assumptions for which the map is C 1+ and -bunched. This automatically implies that for Hausdorffdimension. In 9, the author defines topological pressure of sub-additive potential un- der the condition k(Dxf )1k2kDxf k . For x Xand r
11、0, defineBn(x, r) = y X : f iy B(f ix, r), for all i = 0, , n 1.If is a real continuous function on X and n Z +, letn1Sn(x) = X (f i(x).i=0We definePn(, , ) = supX exp Sn(x) : E is a (n, ) separated subset of X .xEThen the topological pressure of is given by1P (f, ) = lim lim suplog Pn(, ).0n nNext
12、we give some properties of P (f, ) : C (M, R) R .Proposition 1.1. Let f : M M be a continuous transformation of a compact metrisable space M . If 1 , 2 C (X, R), then the followings are true:(1) P (f, 0) = htop(f ).(2) |P (f, 1) P (f, 2)| k1 2 k.(3) 1 2 implies that P (f, 1) P (f, 2).Proof. See Walt
13、ers book 16.Corollary 1. Let f : M M be a continuous transformation of a compact metrisable space M . If C (M, R) and . A sub-additivevaluation on X is a sequence of functions n : M R such thatm+n(x) n(x) + m(f n(x),we denote it by F = n.In the following we will define the topological pressure of F
14、= n with respect tof . We definePn(F , ) = sup XxEexp n(x) : E is a (n, ) separated subset of X .Then the topological pressure of F is given by1P (f, F ) = lim lim suplog Pn(F , ).0n nLet M(X ) be the space of all Borel probability measures endowed with the weak* topology. Let M(X, f ) denote the su
15、bspace of M(X ) consisting of all f -invariant measures. For M(X, f ), let h(f ) denote the entropy of f with respect to , and let F() denote the following limit1 ZF() = limnd.n nThe existence of the above limit follows from a sub-additive argument. We call F() the Lyapunov exponent of F with respec
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