Abbreviated Journal Title
Ann. Probab.
Keywords
Stochastic integration; quartic variation; quadratic variation; stochastic partial differential equations; long-range dependence; iterated Brownian motion; fractional Brownian motion; self-similar; processes; FRACTIONAL BROWNIAN-MOTION; STOCHASTIC INTEGRALS; LIMIT-THEOREMS; HURST; INDEX; Statistics & Probability
Abstract
We consider the solution u(x, t) to a stochastic heat equation. For fixed x, the process F(t) = u(x, t) has a nontrivial quartic variation. It follows that F is not a semimartingale, so a stochastic integral with respect to F cannot be defined in the classical Ito sense. We show that for sufficiently differentiable functions g(x, t), a stochastic integral integral g(F(t), t)d F(t) exists as a limit of discrete, midpoint-style Riemann sums, where the limit is taken in distribution in the Skorokhod space of cadlag functions. Moreover, we show that this integral satisfies a change of variable formula with a correction term that is an ordinary Ito integral with respect to a Brownian motion that is independent of F.
Journal Title
Annals of Probability
Volume
38
Issue/Number
5
Publication Date
1-1-2010
Document Type
Article
DOI Link
Language
English
First Page
1817
Last Page
1869
WOS Identifier
ISSN
0091-1798
Recommended Citation
Burdzy, Krzysztof and Swanson, Jason, "A Change Of Variable Formula With Ito Correction Term" (2010). Faculty Bibliography 2010s. 7023.
https://stars.library.ucf.edu/facultybib2010/7023
Comments
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