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arXiv 1405.2669math.PRq-fin.PR
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纯跳严格局部局部鞅的简单例子

Simple examples of pure-jump strict local martingales

Martin Keller-Ressel

摘要:

本文给出了纯跳严格局部鞅的新的简单例子。的例子被构造为自激仿射马尔可夫过程的指数。我们通过积分准则和相应的常微分方程的非唯一性刻画了这些过程的严格局部鞅性质。最后,我们展示了我们的例子的另一种结构,通过一个绝对连续的测度变化的精神(Delbaen和Schachermayer,PTRF 1995)。

英文摘要:

We present simple new examples of pure-jump strict local martingales. The examples are constructed as exponentials of self-exciting affine Markov processes. We characterize the strict local martingale property of these processes by an integral criterion and by non-uniqueness of an associated ordinary differential equation. Finally we show an alternative construction for our examples by an absolutely continuous measure change in the spirit of (Delbaen and Schachermayer, PTRF 1995).

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