English

Smooth Compactifications of the Abel-Jacobi Section

Algebraic Geometry 2023-01-24 v2

Abstract

For θ\theta a small generic universal stability condition of degree 00 and AA a vector of integers adding up to k(2g2)k(2g-2), the spaces Mg,nθ\overline{M}_{g,n}^\theta resolving the Abel-Jacobi section to the compactified Jacobian Pic^\theta constructed in the work of Abreu-Pacini and Holmes-Molcho-Pandharipande-Pixton-Schmitt are observed to lie inside the space Div\textbf{Div} of Marcus and Wise, and their pullback to the rubber space of loc. cit to be smooth. This provides smooth and modular blowups M~g,nθ\widetilde{M}_{g,n}^\theta of the moduli space of stable curves on which the logarithmic double ramification cycle can be calculated by several methods, old and novel.

Keywords

Cite

@article{arxiv.2212.14375,
  title  = {Smooth Compactifications of the Abel-Jacobi Section},
  author = {Sam Molcho},
  journal= {arXiv preprint arXiv:2212.14375},
  year   = {2023}
}

Comments

30 pages. Comments and suggestions welcome. v2: Fixed a broken reference, some minor rewording in the introduction

R2 v1 2026-06-28T07:56:11.151Z