Pricing VIX options under the Heston-Hawkes stochastic volatility model

TL;DR

This paper develops a semi-analytical, arbitrage-free pricing formula for European VIX call options within a novel Heston-Hawkes stochastic volatility model that captures volatility clustering.

Contribution

It introduces a new Heston-Hawkes model with an explicit VIX pricing formula, combining stochastic volatility with Hawkes process features.

Findings

Derived a semi-analytical pricing formula for VIX options.

Established the existence of generalized Riccati ODEs in the model.

Computed the joint characteristic function using Fourier techniques.

Abstract

We derive a semi-analytical pricing formula for European VIX call options under the Heston-Hawkes stochastic volatility model introduced in arXiv:2210.15343. This arbitrage-free model incorporates the volatility clustering feature by adding an independent compound Hawkes process to the Heston volatility. Using the Markov property of the exponential Hawkes an explicit expression of $\text{VIX}^2$ is derived as a linear combination of the variance and the Hawkes intensity. We apply qualitative ODE theory to study the existence of some generalized Riccati ODEs. Thereafter, we compute the joint characteristic function of the variance and the Hawkes intensity exploiting the exponential affine structure of the model. Finally, the pricing formula is obtained by applying standard Fourier techniques.