Asymptotic distribution of the Betti numbers of M0,n

초록

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 M0,n and the Fulton-MacPherson configuration space ℙ1[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 groups n are also asymptotically normally distributed. In contrast, we provide examples of geometric spaces that do not follow this Gaussian law.

키워드