Exponential ergodicity of an affine two-factor model based on the $α$-root process

We study an affine two-factor model introduced by Barczy et al. (2014). One component of this two-dimensional model is the so-called $α$-root process, which generalizes the well known CIR process. In this paper, we show that this affine two-factor model is exponentially ergodic when $α\in(1,2)$.

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