Yunping Jiang and David Ruelle 2005 Nonlinearity 18 2447 doi:10.1088/0951-7715/18/6/002
Yunping Jiang1,3 and David Ruelle2,4
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We study the expression (susceptibility) ![\[
\begin{equation*}\Psi(\lambda)=\sum_{n=0}^\infty\lambda^n\int_I\!\rho(\rmd
x)X(x){\frac{\rmd}{\rmd x}}(A(f^nx)),\end{equation*}
\]](http://ej.iop.org/images/0951-7715/18/6/002/non192835ude001.gif)
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
with respect to f in the direction of the vector field X.
02.30.-f Function theory, analysis
02.50.-r Probability theory, stochastic processes, and statistics
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)
Issue 6 (November 2005)
Received 11 January 2005, in final form 3 July 2005
Published 8 August 2005
Yunping Jiang and David Ruelle 2005 Nonlinearity 18 2447
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