English

Optimal uniform approximation of L\'evy processes on Banach spaces with finite variation processes

Probability 2020-10-01 v3

Abstract

For a general c\`adl\`ag L\'evy process on a separable Banach space VV we estimate values of infYAXE{ψ(XY)+TV(Y[0,T])}\inf_{Y\in{\cal A}_X} \mathbb{E}\left\{ \psi\left( \Vert X - Y \Vert_\infty\right) + \mathrm{TV}(Y[0,T]) \right\}, where AX{\cal A}_X is the family of processes on VV adapted to the natural filtration of XX, ψ\psi has polynomial growth and TV(Y[0,T])(Y[0,T]) denotes the total variation of the process YY on the interval [0,T][0,T]. Next, we apply obtained estimates in three specific cases: a Brownian motion with drift on R\mathbb{R}, a standard Brownian motion on Rd\mathbb{R}^d and a symmetric α\alpha-stable process (α(1,2)\alpha\in(1,2)) on R\mathbb{R}.

Keywords

Cite

@article{arxiv.1808.08373,
  title  = {Optimal uniform approximation of L\'evy processes on Banach spaces with finite variation processes},
  author = {W. M. Bednorz and Rafał M. Łochowski and R. Martynek},
  journal= {arXiv preprint arXiv:1808.08373},
  year   = {2020}
}