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The rough Hawkes process

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  • Hainaut, Donatien

    (Université catholique de Louvain, LIDAM/ISBA, Belgium)

  • Chen, Maggie
  • Scalas, Enrico

Abstract

This article introduces a new class of self-excited jump processes, with a dampened rough (DR) kernel. The memory of this process is driven by the product of an exponential decreasing function and a kernel involved in the construction of the rough Brownian motion. This process, called rough Hawkes process, is nearly unstable since its intensity diverges to +∞ for a very brief duration when a jump occurs. Firstly, we find the conditions that ensure the stability of the process and provide the closed form expression of the expected intensity. We next reformulate the intensity as an infinite dimensionalMarkov process. Approaching these processes by discretization and next considering the limit leads to the Laplace’s transform of the point process. This transform depends on the solution of an elegant fractional integro-differential equation. The fractional operator is defined by the DR kernel and is similar to the left-fractional Riemann-Liouville integral. We provide a simple method for computing the Laplace’s transform. This is easily invertible by discrete Fourier’s transform for retrieving the probability density of the process. We also modify the Ogata’s algorithm to manage the instability of the process. We conclude by presenting the log-likelihood of the rough Hawkes process and fit it to hourly Bitcoin log-returns from the 9/2/18 to the 9/2/23.

Suggested Citation

  • Hainaut, Donatien & Chen, Maggie & Scalas, Enrico, 2023. "The rough Hawkes process," LIDAM Discussion Papers ISBA 2023007, Université catholique de Louvain, Institute of Statistics, Biostatistics and Actuarial Sciences (ISBA).
    • Handle: RePEc:aiz:louvad:2023007
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    References listed on IDEAS

    as
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