Existence of critical tiltings and local limits of general size-conditioned Bienaymé-Galton-Watson multitype trees
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arXiv
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| Hauptverfasser: | , |
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| Format: | Preprint |
| Veröffentlicht: |
2025
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| _version_ | 1866929759927140352 |
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| author | Poudevigne, Rémy Thévenin, Paul |
| author_facet | Poudevigne, Rémy Thévenin, Paul |
| contents | We are interested in the structure of multitype Bienaymé-Galton-Watson (BGW) trees conditioned on integer linear combinations of the numbers of vertices of given types. We show that, under regularity assumptions on the offspring distributions, it is always possible to find a critical BGW tree having the same conditional distribution. This allows us to prove the existence of local limits for noncritical BGW trees, under a large variety of conditionings. Our proof is based on geometric considerations on the set of the so-called exponential tiltings of a family of offspring distributions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_11501 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Existence of critical tiltings and local limits of general size-conditioned Bienaymé-Galton-Watson multitype trees Poudevigne, Rémy Thévenin, Paul Probability 60B10, 60C05, 60J80 We are interested in the structure of multitype Bienaymé-Galton-Watson (BGW) trees conditioned on integer linear combinations of the numbers of vertices of given types. We show that, under regularity assumptions on the offspring distributions, it is always possible to find a critical BGW tree having the same conditional distribution. This allows us to prove the existence of local limits for noncritical BGW trees, under a large variety of conditionings. Our proof is based on geometric considerations on the set of the so-called exponential tiltings of a family of offspring distributions. |
| title | Existence of critical tiltings and local limits of general size-conditioned Bienaymé-Galton-Watson multitype trees |
| topic | Probability 60B10, 60C05, 60J80 |
| url | https://arxiv.org/abs/2503.11501 |