Stringy invariants for abelian character varieties
Abstract
We compute all stringy invariants, encoding orbifold cohomology numbers, of (the normalization of) the identity component of G-character varieties of free abelian groups and of moduli spaces of G-Higgs bundles on abelian varieties, for all complex connected reductive groups G. As an application, we provide a direct proof of a topological mirror symmetry statement: the equality of the stringy invariants for Langlands dual groups. In the framework of Ginzburg--Kaledin local resolutions, we discuss the meaning of these stringy invariants, showing that symplectic resolutions of these moduli spaces can only exist in the cases of groups of Dynkin type A, B, or C. When such resolutions exist, the computed stringy Hodge numbers agree with the actual Hodge numbers of the resolution.
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BibTeX
@misc{florentino2026stringy,
title = {{Stringy invariants for abelian character varieties}},
author = {Carlos Florentino and Ángel González-Prieto and Alfonso Zamora},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.13337},
eprint = {2609.13337},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.13337},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Stringy invariants for abelian character varieties
AU - Carlos Florentino
AU - Ángel González-Prieto
AU - Alfonso Zamora
PY - 2026
DA - 2026/09/17
PB - arXiv
DO - 10.48550/arxiv.2609.13337
UR - https://arxiv.org/abs/2609.13337
AB - We compute all stringy invariants, encoding orbifold cohomology numbers, of (the normalization of) the identity component of G-character varieties of free abelian groups and of moduli spaces of G-Higgs bundles on abelian varieties, for all complex connected reductive groups G. As an application, we provide a direct proof of a topological mirror symmetry statement: the equality of the stringy invariants for Langlands dual groups. In the framework of Ginzburg--Kaledin local resolutions, we discuss the meaning of these stringy invariants, showing that symplectic resolutions of these moduli spaces can only exist in the cases of groups of Dynkin type A, B, or C. When such resolutions exist, the computed stringy Hodge numbers agree with the actual Hodge numbers of the resolution.
ER -