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arXiv 1105.0632math.PR
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一般状态空间上仿射过程的正则性

Regularity of affine processes on general state spaces

Martin Keller-Ressel, Walter Schachermayer, Josef Teichmann

摘要:

考虑一般状态空间D(即R^d的任意Borel子集)上Duffie,Filipovic和Schachermayer意义下的随机连续仿射马尔可夫过程,具有cadlag路.我们表明,这样的过程总是经常的,这意味着它的傅里叶-拉普拉斯变换是可微的时间,与衍生物是连续的变换变量。因此,我们表明,广义Riccati方程和Levy-Khintchine参数的过程中,可以推导出,在$D = R_+^m \times R^n$的情况下研究Duffie,Filipovic和Schachermayer(2003)。此外,我们还证明了当死亡率为零时,仿射过程是一个半鞅,其特征在爆炸时刻之前是绝对连续的。我们的结果推广了Keller-Ressel,Schachermayer和Teichmann(2011)关于状态空间$R_+^m \times R^n$的结果,并提供了一种新的正则性概率方法.

英文摘要:

We consider a stochastically continuous, affine Markov process in the sense of Duffie, Filipovic and Schachermayer, with cadlag paths, on a general state space D, i.e. an arbitrary Borel subset of R^d. We show that such a process is always regular, meaning that its Fourier-Laplace transform is differentiable in time, with derivatives that are continuous in the transform variable. As a consequence, we show that generalized Riccati equations and Levy-Khintchine parameters for the process can be derived, as in the case of $D = R_+^m \times R^n$ studied in Duffie, Filipovic and Schachermayer (2003). Moreover, we show that when the killing rate is zero, the affine process is a semi-martingale with absolutely continuous characteristics up to its time of explosion. Our results generalize the results of Keller-Ressel, Schachermayer and Teichmann (2011) for the state space $R_+^m \times R^n$ and provide a new probabilistic approach to regularity.

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