Permutation invariant functionals of Lévy processes

Baumgartner, F.; Geiss, S.

doi:10.1090/tran/7001

Permutation invariant functionals of Lévy processes
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by F. Baumgartner and S. Geiss PDF

Trans. Amer. Math. Soc. 369 (2017), 8607-8641 Request permission

Abstract:

We study natural invariance properties of functionals defined on Lévy processes and show that they can be described by a simplified structure of the deterministic chaos kernels in Itô’s chaos expansion. These structural properties of the kernels relate intrinsically to a measurability with respect to invariant $\sigma$-algebras. This makes it possible to apply deterministic functions to invariant functionals on Lévy processes while keeping the simplified structure of the kernels. This stability is crucial for applications. Examples are given as well.

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