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Diffusion approximation of multi-class Hawkes processes: Theoretical and numerical analysis

Published online by Cambridge University Press:  08 October 2021

Julien Chevallier*
Affiliation:
Université Grenoble Alpes
Anna Melnykova*
Affiliation:
Université de Cergy-Pontoise and Université Grenoble Alpes
Irene Tubikanec*
Affiliation:
Johannes Kepler University Linz
*
*Postal address: Université Grenoble Alpes, LJK UMR-CNRS 5224.
**Postal address: Université de Cergy-Pontoise, AGM UMR-CNRS 8088.
***Postal address: Institute for Stochastics, Johannes Kepler University Linz.

Abstract

Oscillatory systems of interacting Hawkes processes with Erlang memory kernels were introduced by Ditlevsen and Löcherbach (Stoch. Process. Appl., 2017). They are piecewise deterministic Markov processes (PDMP) and can be approximated by a stochastic diffusion. In this paper, first, a strong error bound between the PDMP and the diffusion is proved. Second, moment bounds for the resulting diffusion are derived. Third, approximation schemes for the diffusion, based on the numerical splitting approach, are proposed. These schemes are proved to converge with mean-square order 1 and to preserve the properties of the diffusion, in particular the hypoellipticity, the ergodicity, and the moment bounds. Finally, the PDMP and the diffusion are compared through numerical experiments, where the PDMP is simulated with an adapted thinning procedure.

Type
Original Article
Copyright
© The Author(s) 2021. Published by Cambridge University Press on behalf of Applied Probability Trust

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