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- W4287997634 abstract "For two independent L'evy processes $xi$ and $eta$ and an exponentially distributed random variable $tau$ with parameter $q>0$, independent of $xi$ and $eta$, the killed exponential functional is given by $V_{q,xi,eta} := int_0^tau mathrm{e}^{-xi_{s-}} , mathrm{d} eta_s$. Interpreting the case $q=0$ as $tau=infty$, the random variable $V_{q,xi,eta}$ is a natural generalization of the exponential functional $int_0^infty mathrm{e}^{-xi_{s-}} , mathrm{d} eta_s$, the law of which is well-studied in the literature as it is the stationary distribution of a generalised Ornstein-Uhlenbeck process. In this paper we show that also the law of the killed exponential functional $V_{q,xi,eta}$ arises as a stationary distribution of a solution to a stochastic differential equation, thus establishing a close connection to generalised Ornstein-Uhlenbeck processes. Moreover, the support and continuity of the law of killed exponential functionals is characterised, and many sufficient conditions for absolute continuity are derived. We also obtain various new sufficient conditions for absolute continuity of $smash{int_0^tmathrm{e}^{-xi_{s-}}mathrm{d}eta_s}$ for fixed $tgeq0$, as well as for integrals of the form $smash{int_0^infty f(s) , mathrm{d}eta_s}$ for deterministic functions $f$. Furthermore, applying the same techniques to the case $q=0$, new results on the absolute continuity of the improper integral $int_0^infty mathrm{e}^{-xi_{s-}} , mathrm{d} eta_s$ are derived." @default.
- W4287997634 created "2022-07-26" @default.
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- W4287997634 date "2019-12-06" @default.
- W4287997634 modified "2023-09-29" @default.
- W4287997634 title "Continuity properties and the support of killed exponential functionals" @default.
- W4287997634 doi "https://doi.org/10.48550/arxiv.1912.03052" @default.
- W4287997634 hasPublicationYear "2019" @default.
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