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PreprintarXiv licencearXiv

Weak synchronisation for McKean--Vlasov SDEs

  • Benjamin Gess
  • Rishabh S. Gvalani
  • Shanshan Hu
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Abstract

Synchronisation by noise for McKean--Vlasov stochastic differential equations is investigated. A transfer principle is introduced by which synchronisation by noise and diagonal mixing can be transferred from an associated limiting frozen-diffusion SDE to a genuinely law-dependent McKean--Vlasov SDE. The usefulness of this principle is demonstrated through an application to ensemble Kalman sampling, thereby providing its first application in a sampling context. Synchronisation for SDEs with multiplicative noise is then revisited from the perspective of sampling. Existing general frameworks providing sufficient conditions for synchronisation by noise are refined and extended to a control-oriented setting on noncompact state spaces, and coefficient-level conditions are derived by which these criteria can be verified. Motivated by extrapolation schemes in sampling, the freedom in the construction of couplings for a fixed sampler is emphasised, together with the advantage of choosing couplings that exhibit favourable synchronisation properties.

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Cite

BibTeXRIS
BibTeX
@misc{gess2026weak,
  title = {{Weak synchronisation for McKean--Vlasov SDEs}},
  author = {Benjamin Gess and Rishabh S. Gvalani and Shanshan Hu},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.09100},
  eprint = {2609.09100},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.09100},
}
RIS
TY  - UNPB
TI  - Weak synchronisation for McKean--Vlasov SDEs
AU  - Benjamin Gess
AU  - Rishabh S. Gvalani
AU  - Shanshan Hu
PY  - 2026
DA  - 2026/09/08
PB  - arXiv
DO  - 10.48550/arxiv.2609.09100
UR  - https://arxiv.org/abs/2609.09100
AB  - Synchronisation by noise for McKean--Vlasov stochastic differential equations is investigated. A transfer principle is introduced by which synchronisation by noise and diagonal mixing can be transferred from an associated limiting frozen-diffusion SDE to a genuinely law-dependent McKean--Vlasov SDE. The usefulness of this principle is demonstrated through an application to ensemble Kalman sampling, thereby providing its first application in a sampling context. Synchronisation for SDEs with multiplicative noise is then revisited from the perspective of sampling. Existing general frameworks providing sufficient conditions for synchronisation by noise are refined and extended to a control-oriented setting on noncompact state spaces, and coefficient-level conditions are derived by which these criteria can be verified. Motivated by extrapolation schemes in sampling, the freedom in the construction of couplings for a fixed sampler is emphasised, together with the advantage of choosing couplings that exhibit favourable synchronisation properties.
ER  -