Geometric ergodicity of affine processes on cones

Eberhard Mayerhofer, Robert Stelzer and Johanna Vestweber

Stochastic Processes and their Applications, 2020, vol. 130, issue 7, 4141-4173

Abstract: For affine processes on finite-dimensional cones, we give criteria for geometric ergodicity — that is exponentially fast convergence to a unique stationary distribution. Ergodic results include both the existence of exponential moments of the limiting distribution, where we exploit the crucial affine property, and finite moments, where we invoke the polynomial property of affine semigroups. Furthermore, we elaborate sufficient conditions for aperiodicity and irreducibility. Our results are applicable to Wishart processes with jumps on the positive semidefinite matrices, continuous-time branching processes with immigration in high dimensions, and classical term-structure models for credit and interest rate risk.

Keywords: Affine process; Geometric ergodicity; Feller process; Foster–Lyapunov drift condition; Harris recurrence; Wishart process (search for similar items in EconPapers)
Date: 2020
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Citations: View citations in EconPapers (5)

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DOI: 10.1016/j.spa.2019.11.012

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