Duality between Eigenfunctions and Eigendistributions of Ruelle and Koopman operators via an integral kernel

We consider the classical dynamics given by a one sided shift on the Bernoulli space of $d$ symbols. We study, on the space of Hölder functions, the eigendistributions of the Ruelle operator with a given potential. Our main theorem shows that for any isolated eigenvalue, the eigendistributions of such Ruelle operator are dual to eigenvectors of a Ruelle operator with a conjugate potential. We also show that the eigenfunctions and eigendistributions of the Koopman operator satisfy a similar relationship. To show such results we employ an integral kernel technique, where the kernel used is the involution kernel.

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