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- W3124397310 abstract "Time homogeneous polynomial processes are Markov processes whose moments can be calculated easily through matrix exponentials. In this work, we develop a notion of time inhomogeneous polynomial processes where the coeffiecients of the process may depend on time. A full characterization of this model class is given by means of their semimartingale characteristics. We show that in general, the computation of moments by matrix exponentials is no longer possible. As an alternative we explore a connection to Magnus series for fast numerical approximations. Time-inhomogeneity is important in a number of applications: in term-structure models, this allows a perfect calibration to available prices. In electricity markets, seasonality comes naturally into play and have to be captured by the used models. The model class studied in this work extends existing models, for example Sato processes and time-inhomogeneous affine processes." @default.
- W3124397310 created "2021-02-01" @default.
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- W3124397310 date "2018-01-01" @default.
- W3124397310 modified "2023-09-27" @default.
- W3124397310 title "Time-inhomogeneous polynomial processes" @default.
- W3124397310 hasPublicationYear "2018" @default.
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