Communications in Mathematical Sciences
Volume 3 (2005)
Analysis of SPDEs arising in path sampling. Part I: The Gaussian case
Pages: 587 – 603
In many applications it is important to be able to sample paths of SDEs conditional on observations of various kinds. This paper studies SPDEs which solve such sampling problems. The SPDE may be viewed as an infinite dimensional analogue of the Langevin SDE used in finite dimensional sampling. Here the theory is developed for conditioned Gaussian processes for which the resulting SPDE is linear. Applications include the Kalman-Bucy filter/smoother. A companion paper studies the nonlinear case, building on the linear analysis provided here.
2010 Mathematics Subject Classification
Primary 60H15. Secondary 60G15, 60G35, 60H10.