Abstract

For a L\'evy process $X_t$ with quadratic variation process $V_t=\sigma^2 t+ \sum_{00$, we give stability and compactness results, as $t\downarrow 0$, for the convergence both of the deterministically normed (and possibly centered) processes $X_t$ and $V_t$, as well as theorems concerning the ``self-normalised" process $X_{t}/\sqrt{V_t}$. As a main application it is shown that $X_{t}/\sqrt{V_t}\Rightarrow N(0,1)$, a standard normal random variable, as $t\downarrow 0$, if and only if $X_t/b(t)\Rightarrow N(0,1)$, as $t\downarrow 0$, for some non-stochastic function $b(t)>0$; thus, $X_t$ is in the domain of attraction of the normal distribution, as $t\downarrow 0$, with or without centering constants being necessary (these being equivalent). We cite simple analytic equivalences for the above properties, in terms of the L\'evy measure of $X$.



Information:

Date:	Tuesday, July 13, 2010, 9:00-11:00
Place:	Niavaran Bldg., Niavaran Square, Tehran, Iran