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Variations of Hausdorff Dimension in the Exponential Family
Guillaume Havard 1, 2, Mariusz Urbanski 3, Michel Zinsmeister 1
(2008)

In this paper we deal with the following family of exponential maps $(f_\lambda:z\mapsto \lambda(e^z-1))_{\lambda\in [1,+\infty)}$. Denoting $d(\lambda)$ the hyperbolic dimension of $f_\lambda$. It is known that the function $\lambda\mapsto d(\lambda)$ is real analytic in $(1,+\infty)$, and that it is continuous in $[1,+\infty)$. In this paper we prove that this map is C$^1$ on $[1,+\infty)$, with $d'(1^+)=0$. Moreover, depending on the value of $d(1)$, we give estimates of the speed of convergence towards $0$.
1 :  Mathématiques - Analyse, Probabilités, Modélisation - Orléans (MAPMO)
Université d'Orléans – CNRS : UMR7349
2 :  Laboratoire de Mathématiques
CNRS : UMR6620 – Université Blaise Pascal - Clermont-Ferrand II
3 :  Department of Mathematics
Department of Mathematics – University of North Texas
Mathématiques/Systèmes dynamiques
Hausdorff dimension – Julia set – exponential family – parabolic points – thermodynamic formalism – conformal measures.
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