English

A Wong-Zakai theorem for SDEs with singular drift

Probability 2021-09-28 v1

Abstract

We study stochastic differential equations (SDEs) with multiplicative Stratonovich-type noise of the form dXt=b(Xt)dt+σ(Xt)dWt,X0=x0Rd,t0, dX_t = b(X_t) dt + \sigma(X_t)\circ d W_t, X_0=x_0\in\mathbb{R}^d, t\geq0, with a possibly singular drift bLp(Rd)b\in L^{{p}}(\mathbb{R}^d), p>dp>d and p2p\geq 2, and show that such SDEs can be approximated by random ordinary differential equations by smoothing the noise and the singular drift at the same time. We further prove a support theorem for this class of SDEs in a rather simple way using the Girsanov theorem.

Keywords

Cite

@article{arxiv.2109.12158,
  title  = {A Wong-Zakai theorem for SDEs with singular drift},
  author = {Chengcheng Ling and Sebastian Riedel and Michael Scheutzow},
  journal= {arXiv preprint arXiv:2109.12158},
  year   = {2021}
}

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19 pages