Instanton sheaves and representations of quivers

Marcos Jardim; Danilo D. da Silva

doi:10.1017/s0013091520000292

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arXiv · 1905.12092

Instanton sheaves and representations of quivers

Marcos Jardim·Danilo D. da Silva

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Abstract

We study the moduli space of rank 2 instanton sheaves on $\p3$ in terms of representations of a quiver consisting of 3 vertices and 4 arrows between two pairs of vertices. Aiming at an alternative compactification for the moduli space of instanton sheaves, we show that for each rank 2 instanton sheaf, there is a stability parameter $\theta$ for which the corresponding quiver representation is $\theta$-stable (in the sense of King), and that the space of stability parameters has a non trivial wall-and-chamber decomposition. Looking more closely at instantons of low charge, we prove that there are stability parameters with respect to which every representation corresponding to a rank 2 instanton sheaf of charge 2 is stable, and provide a complete description of the wall-and-chamber decomposition for representation corresponding to a rank 2 instanton sheaf of charge 1.

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Marcos Jardim, Danilo D. da Silva. 2019-05-28. Instanton sheaves and representations of quivers. https://doi.org/10.1017/s0013091520000292

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