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Barczy Mátyás: On distributions of jumps of multi-type CBI processes

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Szerda, 3. Április 2024, 14:00 - 16:00
Abstract: Distributional properties of jumps of single-type continuous-state branching processes with immigration (single-type CBI processes) have been recently studied by He and Li (2016).In our talk, we investigate such properties of jumps of multi-type CBI processes.We derive an expression for the distribution function of the first jump time of a multi-type CBI process with jump size in a given Borel set having finite total Lévy measure (which is defined as the sum of the measures appearing in the branching and immigration mechanisms of the multi-type CBI process in question). Using this we derive an expression for the distribution function of the local supremum of the norm of the jumps of a multi-type CBI process. Further, we show that if A is a nondegenerate rectangle anchored at zero and with total Lévy measure zero, then the probability that the local coordinate-wise supremum of jumps of the multi-type CBI process belongs to A is zero. We also prove that a converse statement holds.This is a joint work with Sandra Palau and it is based on our paper Arxiv 2308.05639.
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