On the absolute continuity of a class of invariant measures
HTML articles powered by AMS MathViewer
- by Tian-You Hu, Ka-Sing Lau and Xiang-Yang Wang PDF
- Proc. Amer. Math. Soc. 130 (2002), 759-767 Request permission
Abstract:
Let $X$ be a compact connected subset of ${\mathbb R}^d$, let $S_j, j=1,...,N$, be contractive self-conformal maps on a neighborhood of $X$, and let $\{p_j(x)\}_{j=1}^N$ be a family of positive continuous functions on $X$. We consider the probability measure $\mu$ that satisfies the eigen-equation \[ \lambda \mu =\sum _{j=1}^Np_j(\cdot )\mu \circ S_j^{-1}, \] for some $\lambda >0$. We prove that if the attractor $K$ is an $s$-set and $\mu$ is absolutely continuous with respect to ${\mathcal H}^s|_K$, the Hausdorff $s$-dimensional measure restricted on the attractor $K$, then ${\mathcal H}^s|_K$ is absolutely continuous with respect to $\mu$ (i.e., they are equivalent). A special case of the result was considered by Mauldin and Simon (1998). In another direction, we also consider the $L^p$-property of the Radon-Nikodym derivative of $\mu$ and give a condition for which $D\mu$ is unbounded.References
- Rufus Bowen, Equilibrium states and the ergodic theory of Anosov diffeomorphisms, Lecture Notes in Mathematics, Vol. 470, Springer-Verlag, Berlin-New York, 1975. MR 0442989
- K. J. Falconer, The geometry of fractal sets, Cambridge Tracts in Mathematics, vol. 85, Cambridge University Press, Cambridge, 1986. MR 867284
- Ai Hua Fan and Ka-Sing Lau, Iterated function system and Ruelle operator, J. Math. Anal. Appl. 231 (1999), no. 2, 319–344. MR 1669203, DOI 10.1006/jmaa.1998.6210
- T.Y. Hu and K.S. Lau, Hausdorff dimension of the level sets of Rademacher series, Bull. Polish Acad. Sci. Math. 41 (1993), 11-18
- K.S. Lau, S.M. Ngai and H. Rao, Iterated function systems with overlaps and self-similar measures, J. London Math. Soc. (2) 63 (2001), 99–116.
- R. Daniel Mauldin and Károly Simon, The equivalence of some Bernoulli convolutions to Lebesgue measure, Proc. Amer. Math. Soc. 126 (1998), no. 9, 2733–2736. MR 1458276, DOI 10.1090/S0002-9939-98-04460-8
- R. Daniel Mauldin and Mariusz Urbański, Dimensions and measures in infinite iterated function systems, Proc. London Math. Soc. (3) 73 (1996), no. 1, 105–154. MR 1387085, DOI 10.1112/plms/s3-73.1.105
- Y. Peres, M. Rams, K. Simon and B. Solomyak, Equivalence of positive Hausdorff measure and the open set condition for self-conformal sets Proc. Amer. Math. Soc. (to appear)
- Yuval Peres and Boris Solomyak, Self-similar measures and intersections of Cantor sets, Trans. Amer. Math. Soc. 350 (1998), no. 10, 4065–4087. MR 1491873, DOI 10.1090/S0002-9947-98-02292-2
- Y. Peres, W. Schlag and B. Solomyak, Sixty years of Bernoulli convolutions, Fractals and Stochastics II, (C. Band, S. Graf and M. Zaehle, eds.), Progress in probability 46, 39-65. Birhauser, 2000
- Anthony N. Quas, Non-ergodicity for $C^1$ expanding maps and $g$-measures, Ergodic Theory Dynam. Systems 16 (1996), no. 3, 531–543. MR 1395051, DOI 10.1017/s0143385700008956
Additional Information
- Tian-You Hu
- Affiliation: Department of Mathematics, University of Wisconsin-Green Bay, Green Bay, Wisconsin 54311
- Email: HUT@uwgb.edu
- Ka-Sing Lau
- Affiliation: Department of Mathematics, The Chinese University of Hong Kong, Hong Kong
- MR Author ID: 190087
- Email: kslau@math.cuhk.edu.hk
- Xiang-Yang Wang
- Affiliation: Department of Mathematics, The Chinese University of Hong Kong, Hong Kong
- Email: xywang@math.cuhk.edu.hk
- Received by editor(s): September 12, 2000
- Published electronically: October 1, 2001
- Additional Notes: The first two authors were supported by an HK RGC grant
- Communicated by: David Preiss
- © Copyright 2001 American Mathematical Society
- Journal: Proc. Amer. Math. Soc. 130 (2002), 759-767
- MSC (2000): Primary 28A80; Secondary 42B10
- DOI: https://doi.org/10.1090/S0002-9939-01-06363-8
- MathSciNet review: 1866031