Minimal entropy preserves the Lévy property: how and why

Minimal entropy preserves the Lévy property: how and why
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DOI:
10.1016/j.spa.2004.05.009
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发表时间:
2005-02
影响因子:
1.4
通讯作者:
Felix Esche;M. Schweizer
Felix Esche;M. Schweizer
中科院分区:
数学3区
文献类型:
--
作者:
Felix Esche;M. Schweizer

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设L是在P自身过滤下的多维lsamvy过程,并考虑所有的概率测度Q使L变成一个局部鞅。最小熵鞅测度qe是使相对于p的熵最小的唯一的Q。我们证明了在qe下L仍然是一个lsamvy过程,并精确地解释了这种lsamvy性质是如何以及为什么会保持的。
Let L be a multidimensional Lévy process under P in its own filtration and consider all probability measures Q turning L into a local martingale. The minimal entropy martingale measure QEis the unique Q which minimizes the relative entropy with respect to P. We prove that L is still a Lévy process under QEand explain precisely how and why this preservation of the Lévy property occurs.