Optimal Wasserstein-1 distance between SDEs driven by Brownian motion and stable processes
Research output: Contribution to journal › Research article › Contributed › peer-review
Contributors
Abstract
We are interested in the following two Rd-valued stochastic differential equations (SDEs): (Formula Presented), where σ is an invertible d × d matrix, Lt is a rotationally symmetric α-stable Lévy process, and Bt is a d-dimensional standard Brownian motion (note that Bt is a rotationally symmetric α-stable Lévy process with α = 2). We show that for any α0 ∈(1,2) the Wasserstein-1 distance W1 satisfies for α ∈[α0,2) [Formula Presented.] which implies, in particular, [Formula Presented.] where μα and μ2 are the ergodic measures of Xt and Yt respectively. For the special case of a d-dimensional Ornstein–Uhlenbeck system, we show that W1(μα,μ2)≥Cd (2 − α) for all α ∈(1,2); this indicates that the convergence rate with respect to α in the previous bound is optimal. The term d log(1 + d) appearing in the bound seems to also be optimal for the dimension d.
Details
| Original language | English |
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| Pages (from-to) | 1834-1857 |
| Number of pages | 24 |
| Journal | Bernoulli : official journal of the Bernoulli Society for Mathematical Statistics and Probability |
| Volume | 31 |
| Issue number | 3 |
| Publication status | Published - Aug 2025 |
| Peer-reviewed | Yes |
External IDs
| Scopus | 105002808395 |
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