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Analysis of kinetic Langevin Monte Carlo under the stocha...
[Submitted on 4 Oct 2025 (v1), last revised 18 Jul 2026 (this ve · 2025-10-05 · via stat updates on arXiv.org

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Abstract:Simulating the kinetic Langevin dynamics is a popular approach for sampling from distributions, where only their unnormalized densities are available. Various discretizations of the kinetic Langevin dynamics have been considered, where the resulting algorithm is collectively referred to as the kinetic Langevin Monte Carlo (KLMC) or underdamped Langevin Monte Carlo. Specifically, the stochastic exponential Euler discretization, or exponential integrator for short, has previously been studied under strongly log-concave and log-Lipschitz smooth potentials via the synchronous Wasserstein coupling strategy. Existing analyses, however, impose restrictions on the parameters that do not explain the behavior of KLMC under various choices of parameters. In particular, all known results fail to hold in the overdamped regime, suggesting that the exponential integrator degenerates in the overdamped limit. In this work, we revisit the synchronous Wasserstein coupling analysis of KLMC with the exponential integrator. Our refined analysis results in Wasserstein contractions and bounds on the asymptotic bias that hold under weaker restrictions on the parameters, which assert that the exponential integrator is capable of stably simulating the kinetic Langevin dynamics in the overdamped regime, as long as proper time acceleration is applied.

Submission history

From: Kyurae Kim [view email]
[v1] Sat, 4 Oct 2025 21:30:44 UTC (675 KB)
[v2] Tue, 7 Oct 2025 17:41:23 UTC (676 KB)
[v3] Thu, 7 May 2026 13:35:36 UTC (677 KB)
[v4] Sat, 18 Jul 2026 07:24:42 UTC (677 KB)