| HAL : hal-00660548, version 1 |
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| On the length of an external branch in the Beta-coalescent |
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| Jean-Stephane Dhersin 1, 2Fabian Freund 3 |
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| (08/01/2012) |
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| In this paper, we consider Beta$(2-{\alpha},{\alpha})$ (with $1<{\alpha}<2$) and related ${\Lambda}$-coalescents. If $T^{(n)}$ denotes the length of an external branch of the $n$-coalescent, we prove the convergence of $n^{{\alpha}-1}T^{(n)}$ when $n$ tends to $ \infty $, and give the limit. To this aim, we give asymptotics for the number $\sigma^{(n)}$ of collisions which occur in the $n$-coalescent until the end of the chosen external branch, and for the block counting process associated with the $n$-coalescent. |
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| 1 : | Institut Galilée (IG) |
| Université Paris XIII - Paris Nord | |
| 2 : | Laboratoire Analyse, Géométrie et Application (LAGA) |
| CNRS : UMR7539 – Université Paris XIII - Paris Nord – Université Paris VIII - Vincennes Saint-Denis | |
| 3 : | Institute of Plant Breeding, Seed Science and Population Genetics |
| University of Hohenheim | |
| 4 : | Centro de Investigación en Matemáticas (CIMAT) |
| University of Guanajuato | |
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| Domaine | : | Mathématiques/Probabilités |
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| Coalescent process – Beta-coalescent – external branch – block counting process – recursive construction |
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| Liste des fichiers attachés à ce document : | ||||||||||
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| hal-00660548, version 1 | |
| http://hal.archives-ouvertes.fr/hal-00660548 | |
| oai:hal.archives-ouvertes.fr:hal-00660548 | |
| Contributeur : Jean-Stephane Dhersin | |
| Soumis le : Mardi 17 Janvier 2012, 08:44:11 | |
| Dernière modification le : Mardi 17 Janvier 2012, 08:51:38 | |