Strong order of convergence of a fully discrete approximation of a linear stochastic Volterra type evolution equation
Authors:
Mihály Kovács and Jacques Printems
Journal:
Math. Comp. 83 (2014), 2325-2346
MSC (2010):
Primary 34A08, 45D05, 60H15, 60H35, 65M12, 65M60
DOI:
https://doi.org/10.1090/S0025-5718-2014-02803-2
Published electronically:
January 27, 2014
MathSciNet review:
3223334
Full-text PDF Free Access
Abstract | References | Similar Articles | Additional Information
In this paper we investigate a discrete approximation in time and in space of a Hilbert space valued stochastic process $\{u(t)\}_{t\in [0,T]}$ satisfying a stochastic linear evolution equation with a positive-type memory term driven by an additive Gaussian noise. The equation can be written in an abstract form as \[ \mathrm {d} u + \left ( \int _0^t b(t-s) Au(s) \mathrm {d} s \right ) \mathrm {d} t = \mathrm {d} W^{_Q},~t\in (0,T]; \quad u(0)=u_0 \in H, \] where $W^{_Q}$ is a $Q$-Wiener process on $H=L^2({\mathcal D})$ and where the main example of $b$ we consider is given by \[ b(t) = t^{\beta -1}/\Gamma (\beta ), \quad 0 < \beta <1. \] We let $A$ be an unbounded linear self-adjoint positive operator on $H$ and we further assume that there exist $\alpha >0$ such that $A^{-\alpha }$ has finite trace and that $Q$ is bounded from $H$ into $D(A^\kappa )$ for some real $\kappa$ with $\alpha -\frac {1}{\beta +1}<\kappa \leq \alpha$.
The discretization is achieved via an implicit Euler scheme and a Laplace transform convolution quadrature in time (parameter $\Delta t =T/n$), and a standard continuous finite element method in space (parameter $h$). Let $u_{n,h}$ be the discrete solution at $T=n\Delta t$. We show that \begin{equation*} \left ( \mathbb {E} \| u_{n,h} - u(T)\|^2 \right )^{1/2}={\mathcal O}(h^{\nu } + \Delta t^\gamma ), \end{equation*} for any $\gamma < (1 - (\beta +1)(\alpha - \kappa ))/2$ and $\nu \leq \frac {1}{\beta +1}-\alpha +\kappa$.
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Additional Information
Mihály Kovács
Affiliation:
Department of Mathematics and Statistics, University of Otago, P.O. Box 56, Dunedin, 9054, New Zealand
Email:
mkovacs@maths.otago.ac.nz
Jacques Printems
Affiliation:
Laboratoire d’Analyse et de Mathématiques Appliquées, CNRS UMR 8050, 61, avenue du Général de Gaulle, Université Paris–Est, 94010 Créteil, France
Email:
printems@u-pec.fr
Keywords:
Stochastic Volterra equation,
fractional differential equation,
finite elements method,
convolution quadrature,
Euler scheme,
strong order
Received by editor(s):
July 9, 2012
Received by editor(s) in revised form:
January 30, 2013
Published electronically:
January 27, 2014
Article copyright:
© Copyright 2014
American Mathematical Society
The copyright for this article reverts to public domain 28 years after publication.