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Transactions of the American Mathematical Society
Transactions of the American Mathematical Society
ISSN 1088-6850(online) ISSN 0002-9947(print)

 

A local-time correspondence for stochastic partial differential equations


Authors: Mohammud Foondun, Davar Khoshnevisan and Eulalia Nualart
Journal: Trans. Amer. Math. Soc. 363 (2011), 2481-2515
MSC (2000): Primary 60H15, 60J55; Secondary 35R60, 35D05
Published electronically: December 3, 2010
MathSciNet review: 2763724
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Abstract: It is frequently the case that a white-noise-driven parabolic and/or hyperbolic stochastic partial differential equation (SPDE) can have random-field solutions only in spatial dimension one. Here we show that in many cases, where the ``spatial operator'' is the $ L^2$-generator of a Lévy process $ X$, a linear SPDE has a random-field solution if and only if the symmetrization of $ X$ possesses local times. This result gives a probabilistic reason for the lack of existence of random-field solutions in dimensions strictly larger than one.

In addition, we prove that the solution to the SPDE is [Hölder] continuous in its spatial variable if and only if the said local time is [Hölder] continuous in its spatial variable. We also produce examples where the random-field solution exists, but is almost surely unbounded in every open subset of space-time. Our results are based on first establishing a quasi-isometry between the linear $ L^2$-space of the weak solutions of a family of linear SPDEs, on one hand, and the Dirichlet space generated by the symmetrization of $ X$, on the other hand.

We mainly study linear equations in order to present the local-time correspondence at a modest technical level. However, some of our work has consequences for nonlinear SPDEs as well. We demonstrate this assertion by studying a family of parabolic SPDEs that have additive nonlinearities. For those equations we prove that if the linearized problem has a random-field solution, then so does the nonlinear SPDE. Moreover, the solution to the linearized equation is [Hölder] continuous if and only if the solution to the nonlinear equation is, and the solutions are bounded and unbounded together as well. Finally, we prove that in the cases where the solutions are unbounded, they almost surely blow up at exactly the same points.


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Additional Information

Mohammud Foondun
Affiliation: Department of Mathematics, The University of Utah, 155 S. 1400 E., Salt Lake City, Utah 84112-0090
Email: mohammud@math.utah.edu

Davar Khoshnevisan
Affiliation: Department of Mathematics, The University of Utah, 155 S. 1400 E., Salt Lake City, Utah 84112-0090
Email: davar@math.utah.edu

Eulalia Nualart
Affiliation: Institut Galilée, Université Paris 13, 93430 Villetaneuse, France
Email: nualart@math.univ-paris13.fr

DOI: http://dx.doi.org/10.1090/S0002-9947-2010-05017-2
PII: S 0002-9947(2010)05017-2
Keywords: Stochastic heat equation, stochastic wave equation, Gaussian noise, existence of process solutions, local times, isomorphism theorems
Received by editor(s): November 14, 2007
Received by editor(s) in revised form: February 14, 2009
Published electronically: December 3, 2010
Additional Notes: The research of the second author was supported in part by NSF grants DMS-0404729 and DMS-0706728
Article copyright: © Copyright 2010 American Mathematical Society