In the literature, stochastic interest rate models are implemented, e.g. in Gerstner et al.
(2008) and Graf et al. (2011) to specify the insurer’s asset portfolio process of interest
sensitive investments. While Gerstner et al. (2008) introduce the model from Cox et al.
(1985) in a life insurance asset-liability model, the short rate model from Vasicek (1977) is
applied by Graf et al. (2011) regarding the asset dynamic in the context of participating
life insurance.