Geometric ergodicity of affine processes on cones |
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Affiliation: | 1. University of Warwick, Department of Statistics, Coventry, CV4 7AL, UK;2. Carnegie Mellon University, Department of Mathematical Sciences, 5000 Forbes Avenue, Pittsburgh, PA 15213, USA |
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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. |
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Keywords: | Affine process Geometric ergodicity Feller process Foster–Lyapunov drift condition Harris recurrence Wishart process |
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