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2019 Dense blowup for parabolic SPDEs
Le Chen, Jingyu Huang, Davar Khoshnevisan, Kunwoo Kim
Electron. J. Probab. 24: 1-33 (2019). DOI: 10.1214/19-EJP372


The main result of this paper is that there are examples of stochastic partial differential equations [hereforth, SPDEs] of the type \[ \partial _{t} u=\tfrac{1} {2}\Delta u +\sigma (u)\eta \qquad \text{on $(0\,,\infty )\times \mathbb {R}^{3}$} \] such that the solution exists and is unique as a random field in the sense of Dalang [6] and Walsh [31], yet the solution has unbounded oscillations in every open neighborhood of every space-time point. We are not aware of the existence of such a construction in spatial dimensions below $3$.

En route, it will be proved that when $\sigma (u)=u$ there exist a large family of parabolic SPDEs whose moment Lyapunov exponents grow at least sub exponentially in its order parameter in the sense that there exist $A_{1},\beta \in (0\,,1)$ such that \[ \underline{\gamma } (k) := \liminf _{t\to \infty }t^{-1}\inf _{x\in \mathbb{R} ^{3}} \log \mathrm{E} \left (|u(t\,,x)|^{k}\right ) \geqslant A_{1}\exp (A_{1} k^{\beta }) \qquad \text{for all $k\geqslant 2$} . \] This sort of “super intermittency” is combined with a local linearization of the solution, and with techniques from Gaussian analysis in order to establish the unbounded oscillations of the sample functions of the solution to our SPDE.


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Le Chen. Jingyu Huang. Davar Khoshnevisan. Kunwoo Kim. "Dense blowup for parabolic SPDEs." Electron. J. Probab. 24 1 - 33, 2019.


Received: 22 March 2019; Accepted: 9 October 2019; Published: 2019
First available in Project Euclid: 29 October 2019

zbMATH: 07142912
MathSciNet: MR4029421
Digital Object Identifier: 10.1214/19-EJP372

Primary: 35R60, 60H15
Secondary: 60G15


Vol.24 • 2019
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