The moduli space of curves is rigid
Algebraic Geometry
2010-03-16 v2
Abstract
We prove that the moduli stack of stable curves of genus g with n marked points is rigid, i.e., has no infinitesimal deformations. This confirms the first case of a principle proposed by Kapranov. It can also be viewed as a version of Mostow rigidity for the mapping class group.
Cite
@article{arxiv.math/0509567,
title = {The moduli space of curves is rigid},
author = {Paul Hacking},
journal= {arXiv preprint arXiv:math/0509567},
year = {2010}
}
Comments
11 pages. v2: Proof rewritten to avoid use of log structures. Example of nonrigid moduli space of surfaces added