Stochastic processes and financial applications Open access Peer reviewed

Degenerate McKean-Vlasov equations with drift in anisotropic negative Besov spaces

Elena Issoglio, Stefano Pagliarani, Francesco Russo, Davide Trevisani

Journal of Differential Equations | Jun 8, 2026

Abstract

Abstract

The paper is concerned with a McKean-Vlasov type SDE with drift in anisotropic Besov spaces with negative regularity and with degenerate diffusion matrix under the weak H{ö}rmander condition. The main result is of existence and uniqueness of a solution in law for the McKean-Vlasov equation, which is formulated as a suitable martingale problem. All analytical tools needed are derived in the paper, such as the well-posedness of the Fokker-Planck and Kolmogorov PDEs with distributional drift, as well as continuity dependence on the coefficients. The solutions to these PDEs naturally live in anisotropic Besov spaces, for which we developed suitable analytical inequalities, such as Schauder estimates.

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Authors

Researchers on this paper

Elena Issoglio

first | University of Turin | ORCID 0000-0003-3035-2712

Stefano Pagliarani

middle | University of Bologna | ORCID 0000-0003-4329-7054

Francesco Russo

middle | École Nationale Supérieure de Techniques Avancées | ORCID 0000-0002-9890-7465

Davide Trevisani

last

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Citation

BibTeX

@article{Issoglio2026Degenerate,
  title = {Degenerate McKean-Vlasov equations with drift in anisotropic negative Besov spaces},
  author = {Elena Issoglio and Stefano Pagliarani and Francesco Russo and Davide Trevisani},
  journal = {Journal of Differential Equations},
  year = {2026},
  doi = {10.1016/j.jde.2026.114567},
  url = {https://doi.org/10.1016/j.jde.2026.114567}
}

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