On Besov regularity of Brownian motions in infinite dimensions
On Besov regularity of Brownian motions in infinite dimensions
复制标题
无限维布朗运动的贝索夫正则性
DOI:
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发表时间:
2008
期刊:
影响因子:
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通讯作者:
M. Veraar
中科院分区:
文献类型:
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作者:
T. Hytonen;M. Veraar
We extend to the vector-valued situation some earlier work of Ciesielski and Roynette on the Besov regularity of the paths of the classical Brownian motion. We also consider a Brownian motion as a Besov space valued random variable. It turns out that a Brownian motion, in this interpretation, is a Gaussian random variable with some pathological properties. We prove estimates for the first moment of the Besov norm of a Brownian motion. To obtain such results we estimate expressions of the form $E sup_{ngeq 1}|xi_n|$, where the $xi_n$ are independent centered Gaussian random variables with values in a Banach space. Using isoperimetric inequalities we obtain two-sided inequalities in terms of the first moments and the weak variances of $xi_n$.