Exponentially affine martingales, affine measure changes and exponential moments of affine processes

Exponentially affine martingales, affine measure changes and exponential moments of affine processes
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DOI:
10.1016/j.spa.2009.10.012
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发表时间:
2010-02
影响因子:
1.4
通讯作者:
J. Kallsen;Johannes Muhle‐Karbe
J. Kallsen;Johannes Muhle‐Karbe
中科院分区:
数学3区
文献类型:
--
作者:
J. Kallsen;Johannes Muhle‐Karbe

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我们考虑指数形式为M=eXor E(X)的局部鞅,其中X表示多元仿射过程的一个分量。我们给出了M是真鞅的一个弱充分准则。作为第一个应用,我们得到了两个给定仿射过程定律绝对连续性的一个简单充分条件。作为第二个应用,我们研究了仿射过程的指数矩是否解广义Riccati方程。
We consider local martingales of exponential form M=eXor E(X), where X denotes one component of a multivariate affine process. We give a weak sufficient criterion for M to be a true martingale. As a first application, we derive a simple sufficient condition for absolute continuity of the laws of two given affine processes. As a second application, we study whether the exponential moments of an affine process solve a generalized Riccati equation.