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• W2932108602 abstract "We consider the evolution of the genealogy of the population currently alive in a Feller branching diffusion model. In contrast to the approach via labeled trees in the continuum random tree world, the genealogies are modeled as equivalence classes of ultrametric measure spaces, the elements of the space $mathbb{U}$. This space is Polish and has a rich semigroup structure for the genealogy. We focus on the evolution of the genealogy in time and the large time asymptotics conditioned both on survival up to present time and on survival forever. We prove existence, uniqueness and Feller property of solutions of the martingale problem for this genealogy valued, i.e., $mathbb{U}$-valued Feller diffusion. We give the precise relation to the time-inhomogeneous $mathbb{U}_1$-valued Fleming-Viot process. The uniqueness is shown via Feynman-Kac duality with the distance matrix augmented Kingman coalescent. Using a semigroup operation on $mathbb{U}$, called concatenation, together with the branching property we obtain a L{'e}vy-Khintchine formula for $mathbb{U}$-valued Feller diffusion and we determine explicitly the L{'e}vy measure on $mathbb{U}setminus{0}$. From this we obtain for $h>0$ the decomposition into depth-$h$ subfamilies, a representation of the process as concatenation of a Cox point process of genealogies of single ancestor subfamilies. Furthermore, we will identify the $mathbb{U}$-valued process conditioned to survive until a finite time $T$. We study long time asymptotics, such as generalized quasi-equilibrium and Kolmogorov-Yaglom limit law on the level of ultrametric measure spaces. We also obtain various representations of the long time limits." @default.
• W2932108602 created "2019-04-11" @default.
• W2932108602 creator A5069734074 @default.
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• W2932108602 date "2019-04-03" @default.
• W2932108602 modified "2023-09-27" @default.
• W2932108602 title "Tree-valued Feller diffusion" @default.
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