Density behaviour related to Lévy processes
Density behaviour related to Lévy processes
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与 Lévy 过程相关的密度行为
DOI:
10.1090/tran/8268
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发表时间:
2019
影响因子:
1.3
通讯作者:
J. Małecki
中科院分区:
文献类型:
--
作者:
L. Chaumont;J. Małecki
Let $p_t(x)$, $f_t(x)$ and $q_t^*(x)$ be the densities at time $t$ of a real Levy process, its running supremum and the entrance law of the reflected excursions at the infimum. We provide relationships between the asymptotic behaviour of $p_t(x)$, $f_t(x)$ and $q_t^*(x)$, when $t$ is small and $x$ is large. Then for large $x$, these asymptotic behaviours are compared to this of the density of the Levy measure. We show in particular that, under mild conditions, if $p_t(x)$ is comparable to $t\nu(x)$, as $t\rightarrow0$ and $x\rightarrow\infty$, then so is $f_t(x)$.