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Analyticity of the susceptibility function for unimodal Markovian maps of the interval

Yunping Jiang1,3 and David Ruelle2,4

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Recommended by K M Khanin

We study the expression (susceptibility)

\[
\begin{equation*}\Psi(\lambda)=\sum_{n=0}^\infty\lambda^n\int_I\!\rho(\rmd
x)X(x){\frac{\rmd}{\rmd x}}(A(f^nx)),\end{equation*}
\]

where f is a unimodal Markovian map of the interval I, ρ = ρf is the corresponding absolutely continuous invariant measure and A is a C1 function defined on I. We show that Ψ(λ) is analytic near λ = 1, where Ψ(1) is formally the derivative of \int_I\!\rho(\rmd x)A(x) with respect to f in the direction of the vector field X.


PACS

02.30.-f Function theory, analysis

02.50.-r Probability theory, stochastic processes, and statistics

MSC

37C40 Smooth ergodic theory, invariant measures (See also 37Dxx)

37C10 Vector fields, flows, ordinary differential equations

37E05 Maps of the interval (piecewise continuous, continuous, smooth)

Subjects

Mathematical physics

Computational physics

Dates

Issue 6 (November 2005)

Received 11 January 2005, in final form 3 July 2005

Published 8 August 2005



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