Mathematics – Functional Analysis
Scientific paper
2001-04-12
Hiroshima Math. J. 31 (2001) pp299--330
Mathematics
Functional Analysis
To appear in Hiroshima Math. J. 31, Louisiana state university preprint (2000)
Scientific paper
Let $u$ be a positive continuous function on $[0, \infty)$ satisfying the conditions: (i) $\lim_{r\to\infty} r^{-1/2}\log u(r)=\infty$, (ii) $\inf_{r\geq 0} u(r)=1$, (iii) $\lim_{r\to \infty}\break r^{-1}\log u(r)<\infty$, (iv) the function $\log u(x^{2}), x\geq 0$, is convex. A Gel'fand triple $[\ce]_{u} \subset (L^{2}) \subset [\ce]_{u}^{*}$ is constructed by making use of the Legendre transform of $u$ discussed in \cite {akk3}. We prove a characterization theorem for generalized functions in $[\ce]_{u}^{*}$ and also for test functions in $[\ce]_{u}$ in terms of their $S$-transforms under the same assumptions on $u$. Moreover, we give an intrinsic topology for the space$[\ce]_{u}$ of test functions and prove a characterization theorem for measures. We briefly mention the relationship between our method and a recent work by Gannoun et al.\cite{ghor}. Finally, conditions for carrying out white noise operator theory and Wick products are given.
Asai Nobuhiro
Kubo Izumi
Kuo Hui-Hsiung
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