Heavy-Light Wall Crossings and Motivic Asymptotics of Moduli Spaces of Curves. Part I: Stabilization Graphs and Euler Characteristics
Abstract
In this paper, we develop an explicit calculation of ordinary topological Euler characteristics of the coarse moduli spaces underlying Hassett spaces in the minimal all-light chamber and the Deligne-Mumford compactification. For genus g≥2, we organize the calculation through a decomposition indexed by stabilization graphs and their decorations. The Burnside-Lefschetz formula allows us to compute the resulting contributions, taking into account graph symmetries and their fixed loci. The calculation in genus two illustrates the method explicitly and, in the Deligne-Mumford case, recovers the generating function of G. Bini, G. Gaiffi, and M. Polito (arXiv:math/9806048), with the corrections of G. Bini and J. Harer (arXiv:math/0506083), providing a check on the construction. We also carry out the calculation in genus three in an appendix. Together with an elementary genus-one calculation based on collision partitions and rational necklaces, these formulas yield complete asymptotic expansions as the number of labeled markings tends to infinity. The passage from all-light to ordinary Euler characteristics is governed by the universal change of variables Φ(z)=(2−z)ez−2, which we derive by a direct wall-crossing argument. For arbitrary fixed genus g≥2, the same framework identifies the leading contribution of rational trivalent graphs and gives the ordinary asymptotic scale n!(e−2)−nn(3g−5)/2. The leading constants are the symmetry weights of these graphs; we derive their generating function, recurrence, and large-genus behavior. We also determine the asymptotic ratio of all-light to ordinary Euler characteristics, answering a question of S. Kannan, S. Serpente, and C. H. Yun (arXiv:2207.02800).
Related
BibTeX
@misc{cotti2026heavylight,
title = {{Heavy-Light Wall Crossings and Motivic Asymptotics of Moduli Spaces of Curves. Part I: Stabilization Graphs and Euler Characteristics}},
author = {Giordano Cotti},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2611.06862},
eprint = {2611.06862},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2611.06862},
}
RIS
TY - UNPB
TI - Heavy-Light Wall Crossings and Motivic Asymptotics of Moduli Spaces of Curves. Part I: Stabilization Graphs and Euler Characteristics
AU - Giordano Cotti
PY - 2026
DA - 2026/11/04
PB - arXiv
DO - 10.48550/arxiv.2611.06862
UR - https://arxiv.org/abs/2611.06862
AB - In this paper, we develop an explicit calculation of ordinary topological Euler characteristics of the coarse moduli spaces underlying Hassett spaces in the minimal all-light chamber and the Deligne-Mumford compactification. For genus g≥2, we organize the calculation through a decomposition indexed by stabilization graphs and their decorations. The Burnside-Lefschetz formula allows us to compute the resulting contributions, taking into account graph symmetries and their fixed loci. The calculation in genus two illustrates the method explicitly and, in the Deligne-Mumford case, recovers the generating function of G. Bini, G. Gaiffi, and M. Polito (arXiv:math/9806048), with the corrections of G. Bini and J. Harer (arXiv:math/0506083), providing a check on the construction. We also carry out the calculation in genus three in an appendix. Together with an elementary genus-one calculation based on collision partitions and rational necklaces, these formulas yield complete asymptotic expansions as the number of labeled markings tends to infinity. The passage from all-light to ordinary Euler characteristics is governed by the universal change of variables Φ(z)=(2−z)e^z−2, which we derive by a direct wall-crossing argument. For arbitrary fixed genus g≥2, the same framework identifies the leading contribution of rational trivalent graphs and gives the ordinary asymptotic scale n!(e−2)^−nn^(3g−5)/2. The leading constants are the symmetry weights of these graphs; we derive their generating function, recurrence, and large-genus behavior. We also determine the asymptotic ratio of all-light to ordinary Euler characteristics, answering a question of S. Kannan, S. Serpente, and C. H. Yun (arXiv:2207.02800).
ER -