Abstract
In recent years, substantial progress was made towards understanding convergence of fast-slow deterministic systems to stochastic differential equations. In contrast to more classical approaches, the assumptions on the fast flow are very mild. We survey the origins of this theory and then revisit and improve the analysis of Kelly-Melbourne [Ann. Probab. Volume 44, Number 1 (2016), 479–520], taking into account recent progress in p-variation and càdlàg rough path theory.
Dedicated to Professor S.R.S Varadhan on the occasion of his 75th birthday
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- 1.
Since our limit processes here—a Brownian motion—is continuous, there is no need to work with the Skorokhod topology on D.
- 2.
In view of the genuine non-linearity of rough path spaces, we refrain from writing \(\Vert \mathbf {X}- \tilde{\mathbf {X}} \Vert _{p\text {-var},[0,1]}\).
- 3.
In coordinates, when \(\mathcal {B}= \mathbb {R}^m\), we have \(DV (Y_s) V (Y_s) \mathbb {X}_{s,t} = \partial _\alpha V_\gamma (Y_s) V^\alpha _\beta (Y_s) \mathbb {X}_{s,t}^{\beta ,\gamma }\) with summation over \(\alpha = 1, \ldots , d\) and \(\beta , \gamma = 1, \ldots , m.\).
- 4.
Often \(B^n\) has continuous BV sample paths. Every such process is (trivially) a semimartingale (under its own filtration); the Stratonovich SDE interpretation is the one consistent with the ODE interpretation, in the sense of a Riemann-Stieltjes integral equation.
- 5.
Again it suffices to work with the uniform topology on both \({\pmb {\mathscr {C}}}\) and \({\pmb {\mathscr {D}}}\).
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Acknowledgements
I.C. is funded by a Junior Research Fellowship of St John’s College, Oxford. P.K.F. acknowledges partial support from the ERC, CoG-683164, the Einstein Foundation Berlin, and DFG research unit FOR2402. A.K. and I.M. acknowledge partial support from the European Advanced Grant StochExtHomog (ERC AdG 320977). H.Z. is supported by the Chinese National Postdoctoral Program for Innovative Talents No: BX20180075. H.Z. thanks the Institute für Mathematik, TU Berlin, for its hospitality.
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Chevyrev, I., Friz, P.K., Korepanov, A., Melbourne, I., Zhang, H. (2019). Multiscale Systems, Homogenization, and Rough Paths. In: Friz, P., König, W., Mukherjee, C., Olla, S. (eds) Probability and Analysis in Interacting Physical Systems. VAR75 2016. Springer Proceedings in Mathematics & Statistics, vol 283. Springer, Cham. https://doi.org/10.1007/978-3-030-15338-0_2
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