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Uniform pathwise stability of additive singular SDEs driven by fractional Brownian motion

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  • Dareiotis, Konstantinos
  • Haress, El Mehdi
  • Lê, Khoa

Abstract

We study the long-time behaviour of solutions to a class of d-dimensional stochastic differential equations driven by fractional Brownian motion with Hurst parameter H ∈ (0, 1). The drift consists of a dissipative Lipschitz term and a singular term of regularity γ>1−1/(2H) in Besov-Hölder scales. We establish well-posedness as a preliminary step and then we prove, through a Markovian enhancement, existence of an invariant measure. If the singular contribution is sufficiently small, we prove exponential contraction of solutions, and thereby, uniqueness of the invariant measure. Our methods rely on uniform pathwise estimates which utilise together the dissipativity of the drift and the regularisation effect of the noise.

Suggested Citation

  • Dareiotis, Konstantinos & Haress, El Mehdi & Lê, Khoa, 2026. "Uniform pathwise stability of additive singular SDEs driven by fractional Brownian motion," Stochastic Processes and their Applications, Elsevier, vol. 201(C).
    • Handle: RePEc:eee:spapps:v:201:y:2026:i:c:s0304414926001924
    DOI: 10.1016/j.spa.2026.105060
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