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arXiv 1504.04581q-fin.PRq-fin.CPq-fin.MF
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Dirac过程与违约风险

Dirac Processes and Default Risk

Chris Kenyon, Andrew Green

摘要:

我们引入狄拉克过程,使用狄拉克δ函数,短期利率型金融衍生品的定价。狄拉克过程在现有的扩散和跳跃的基础上增加了尖峰。狄拉克过程是广义过程,以前没有直接使用过,因为非实数的美元值是没有意义的。然而,短期利率定价是基于积分,因此狄拉克过程是自然的。这种整合直接意味着跳跃是多余的,而狄拉克过程扩展了短速率方法的表现力。实际上,我们证明了狄拉克过程使高隐含波动率的CDS互换,否则在风险率设置的问题。

英文摘要:

We introduce Dirac processes, using Dirac delta functions, for short-rate-type pricing of financial derivatives. Dirac processes add spikes to the existing building blocks of diffusions and jumps. Dirac processes are Generalized Processes, which have not been used directly before because the dollar value of non-Real numbers is meaningless. However, short-rate pricing is based on integrals so Dirac processes are natural. This integration directly implies that jumps are redundant whilst Dirac processes expand expressivity of short-rate approaches. Practically, we demonstrate that Dirac processes enable high implied volatility for CDS swaptions that has been otherwise problematic in hazard rate setups.

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