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
中科院分区:
文献类型:
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作者:
J. Kallsen;Johannes Muhle‐Karbe
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.