Not-so-complex logarithms in the Heston model

Christian Kahl · Jan-Thorsten Peter

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Stochastic processes and financial applications Financial Risk and Volatility Modeling Fuzzy Systems and Optimization

Abstract

In Heston’s stochastic volatility framework [ Hes93], semi-analytical formulae for plain vanilla option prices can be derived. Unfortunately, these formulae require the evaluation of logarithms with complex arguments during the involved inverse Fourier integration step. This gives rise to an inherent numerical instability as a consequence of which most implementations of Heston’s formulae are not robust for moderate to long dated maturities or strong mean reversion. In this article, we propose a new approach to solve this problem which enables the use of Heston’s analytics for practically all levels of parameters and even maturities of many decades.

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References

1993A Closed-Form Solution for Options with Stochastic Volatility with Applications to Bond and Currency Options 1999Option valuation using the fast Fourier transform 1999Stochastic Volatility With an Ornstein–Uhlenbeck Process: An Extension 2004Option pricing by transform methods: extensions, unification and error control

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