English

A comparison theorem for stochastic differential equations under a Novikov-type condition

Probability 2013-07-15 v1

Abstract

We consider a system of stochastic differential equations driven by a standard n-dimensional Brownian motion where the drift coefficient satisfies a Novikov-type condition while the diffusion coefficient is the identity matrix. We define a vector Z of square integrable stochastic processes with the following property: if the filtration of the translated Brownian motion obtained from the Girsanov transform coincides with the one of the driving noise then Z coincides with the unique strong solution of the equation; otherwise the process Z solves in the strong sense a related stochastic differential inequality. This fact together with an additional assumption will provide a comparison result similar to well known theorems obtained in the presence of strong solutions.

Keywords

Cite

@article{arxiv.1307.3455,
  title  = {A comparison theorem for stochastic differential equations under a Novikov-type condition},
  author = {Alberto Lanconelli},
  journal= {arXiv preprint arXiv:1307.3455},
  year   = {2013}
}

Comments

13 pages

R2 v1 2026-06-22T00:50:30.043Z