Wall-crossing of instantons on the blow-up
4 affiliations
- 1Beijing Institute of Mathematical Sciences and Applications
- 2Tsinghua University
- 3Université Lyon 1, CNRS, IP2I, UMR 5822
- 4Université Bourgogne Europe, CNRS, IMB UMR 5584
Abstract
A bstract : We study the instanton counting in four dimensional 𝒩 N = 2 supersymmetric gauge theories on the blow-up of ℂ ² : we start by formulating the instanton moduli space as a quiver variety, which we regularise by introducing two stability parameters, thus endowing it with a structure of infinitely many chambers separated by walls. Within a given chamber, we formulate the instanton partition function as a contour integral, which can be evaluated using the Jeffrey-Kirwan residue prescription. We characterise the physically relevant contributions in terms of bipartite oriented graphs and show that they can more efficiently be classified in terms of combinatorial objects called super-partitions. Within a given chamber, only certain types of super-partitions contribute and we show that the corresponding selection criteria are equivalent to stability conditions that have previously been proposed in the literature. We use this formalism to compare how the instanton counting changes when moving across walls between neighbouring chambers and provide explicit expressions for the corresponding partition functions. In a limiting chamber and using our approach, we show how to reproduce the Nakajima-Yoshioka blow-up formula.
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BibTeX
@article{filoche2026wallcrossing,
title = {{Wall-crossing of instantons on the blow-up}},
author = {Baptiste Filoche and Stefan Hohenegger and Taro Kimura},
journal = {Journal of High Energy Physics},
year = {2026},
month = oct,
doi = {10.1007/jhep10(2026)164},
url = {https://link.springer.com/article/10.1007/JHEP10(2026)164},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Wall-crossing of instantons on the blow-up
AU - Baptiste Filoche
AU - Stefan Hohenegger
AU - Taro Kimura
PY - 2026
DA - 2026/10/15
JO - Journal of High Energy Physics
DO - 10.1007/jhep10(2026)164
UR - https://link.springer.com/article/10.1007/JHEP10(2026)164
AB - A bstract : We study the instanton counting in four dimensional 𝒩 N = 2 supersymmetric gauge theories on the blow-up of ℂ ² : we start by formulating the instanton moduli space as a quiver variety, which we regularise by introducing two stability parameters, thus endowing it with a structure of infinitely many chambers separated by walls. Within a given chamber, we formulate the instanton partition function as a contour integral, which can be evaluated using the Jeffrey-Kirwan residue prescription. We characterise the physically relevant contributions in terms of bipartite oriented graphs and show that they can more efficiently be classified in terms of combinatorial objects called super-partitions. Within a given chamber, only certain types of super-partitions contribute and we show that the corresponding selection criteria are equivalent to stability conditions that have previously been proposed in the literature. We use this formalism to compare how the instanton counting changes when moving across walls between neighbouring chambers and provide explicit expressions for the corresponding partition functions. In a limiting chamber and using our approach, we show how to reproduce the Nakajima-Yoshioka blow-up formula.
SN - 1029-8479
ER -