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Existence and asymptotic behaviour of some time-inhomogeneous diffusions
Mihai Gradinaru ( ) 1, Yoann Offret ( ) 1
(18/11/2009)

Let us consider a solution of the time-inhomogeneous stochastic differential equation driven by a Brownian motion with drift coefficient $b(t,x)=\rho\,{\rm sgn}(x)|x|^\alpha/t^\beta$. This process can be viewed as a distorted Brownian motion in a potential, possibly singular, depending on time. After obtaining results on existence and uniqueness of solution, we study its asymptotic behaviour and made a precise description, in terms of parameters $\rho,\alpha$ and $\beta$, of the recurrence, transience and convergence. More precisely, asymptotic distributions, iterated logarithm type laws and rates of transience and explosion are proved for such processes.
1 :  Institut de Recherche Mathématique de Rennes (IRMAR)
CNRS : UMR6625 – Université de Rennes 1 – École normale supérieure de Cachan - ENS Cachan – Institut National des Sciences Appliquées (INSA) : - RENNES – Université de Rennes II - Haute Bretagne
Processus stochastiques
Mathématiques/Probabilités
time-inhomogeneous diffusions – singular stochastic differential equations – explosion times – scaling transformations and changes of time – recurrence and transience – iterated logarithm type laws – asymptotic distributions
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