Asymptotic distribution of the Betti numbers of $\overline{\mathcal{M}}_{0,n}$
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arXiv
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| Auteurs principaux: | , |
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| Format: | Preprint |
| Publié: |
2026
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| _version_ | 1866913082036453376 |
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| author | Choi, Jinwon Kiem, Young-Hoon |
| author_facet | Choi, Jinwon Kiem, Young-Hoon |
| contents | Asymptotic normality is frequently observed in large combinatorial structures, rigorously established for many quantities such as cycles or inversions in random permutations, the number of prime factors of random integers, and various parameters of random graphs. In this paper, we investigate whether this normal limit behavior extends to the topological invariants of geometric spaces. We show that the Betti numbers of the moduli space of rational curves with $n$ marked points $\overline{\mathcal{M}}_{0,n}$ and the Fulton-MacPherson configuration space $\mathbb{P}^1[n]$ are asymptotically normally distributed. Based on numerical evidence and established log-concavity, we conjecture that the Betti numbers of the quotients of these spaces by the symmetric group $\mathbb{S}_n$ are also asymptotically normally distributed. In contrast, we provide examples of geometric spaces that do not follow this Gaussian law. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_08369 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Asymptotic distribution of the Betti numbers of $\overline{\mathcal{M}}_{0,n}$ Choi, Jinwon Kiem, Young-Hoon Algebraic Geometry Combinatorics 14H10, 05A16 Asymptotic normality is frequently observed in large combinatorial structures, rigorously established for many quantities such as cycles or inversions in random permutations, the number of prime factors of random integers, and various parameters of random graphs. In this paper, we investigate whether this normal limit behavior extends to the topological invariants of geometric spaces. We show that the Betti numbers of the moduli space of rational curves with $n$ marked points $\overline{\mathcal{M}}_{0,n}$ and the Fulton-MacPherson configuration space $\mathbb{P}^1[n]$ are asymptotically normally distributed. Based on numerical evidence and established log-concavity, we conjecture that the Betti numbers of the quotients of these spaces by the symmetric group $\mathbb{S}_n$ are also asymptotically normally distributed. In contrast, we provide examples of geometric spaces that do not follow this Gaussian law. |
| title | Asymptotic distribution of the Betti numbers of $\overline{\mathcal{M}}_{0,n}$ |
| topic | Algebraic Geometry Combinatorics 14H10, 05A16 |
| url | https://arxiv.org/abs/2601.08369 |