77 research outputs found
Accelerated finite difference schemes for stochastic partial differential equations in the whole space
We give sufficient conditions under which the convergence of finite
difference approximations in the space variable of the solution to the Cauchy
problem for linear stochastic PDEs of parabolic type can be accelerated to any
given order of convergence by Richardson's method.Comment: 24 page
Localization errors in solving stochastic partial differential equations in the whole space
Cauchy problems with SPDEs on the whole space are localized to Cauchy
problems on a ball of radius . This localization reduces various kinds of
spatial approximation schemes to finite dimensional problems. The error is
shown to be exponentially small. As an application, a numerical scheme is
presented which combines the localization and the space and time
discretisation, and thus is fully implementable.Comment: Some details added; published versio
Accelerated finite elements schemes for parabolic stochastic partial differential equations
For a class of finite elements approximations for linear stochastic parabolic
PDEs it is proved that one can accelerate the rate of convergence by Richardson
extrapolation. More precisely, by taking appropriate mixtures of finite
elements approximations one can accelerate the convergence to any given speed
provided the coefficients, the initial and free data are sufficiently smooth.Comment: 1 figur
A Note on Euler Approximations for Stochastic Differential Equations with Delay
An existence and uniqueness theorem for a class of stochastic delay
differential equations is presented, and the convergence of Euler
approximations for these equations is proved under general conditions.
Moreover, the rate of almost sure convergence is obtained under local Lipschitz
and also under monotonicity conditions
On randomized stopping
A general result on the method of randomized stopping is proved. It is applied to optimal stopping of controlled diffusion processes with unbounded coefficients to reduce it to optimal control problem without stopping. This is motivated by recent results of Krylov on numerical solutions to the Bellman equation
First derivatives estimates for finite-difference schemes
Abstract. We give sufficient conditions under which solutions of discretized in space second-order parabolic and elliptic equations, perhaps degenerate, admit estimates of the first derivatives in the space variables independent of the mesh size. 1
On L_p-Solvability of Stochastic Integro-Differential Equations
A class of (possibly) degenerate stochastic integro-differential equations of
parabolic type is considered, which includes the Zakai equation in nonlinear
filtering for jump diffusions. Existence and uniqueness of the solutions are
established in Bessel potential spaces
- …