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arXiv · 2509.20791

Deformation theory of parabolic representation pairs

Zhi Hu·Pengfei Huang·Wanmin Yan·Runhong Zong
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Abstract

In this paper, we introduce the notions of parabolic representation pairs and the parabolic representation pair variety. We investigate the deformation theory of parabolic representation pairs. The Zariski tangent space and the tangent quadratic cone of the parabolic representation pair variety are described. By the Riemann--Hilbert--Deligne correspondence, we pro-represent the analytic germs of parabolic representation pair variety by functors related to certain groupoids of parabolic logarithmic flat bundles. Under suitable assumptions, we prove that the differential graded Lie algebra (DGLA) controlling the deformation of a parabolic logarithmic flat bundle is partially formal. This leads to the quadraticity of the subvariety of parabolic representation pair variety, which consists of parabolic representation pairs with fixed eigenvalues of monodromies, at certain generic points. Finally, we construct the moduli space of weighted parabolic representation pairs, and, by means of quiver representation theory, we establish the Kobayashi--Hitchin-type theorem for polystable parabolic representation pairs.

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Zhi Hu, Pengfei Huang, Wanmin Yan, Runhong Zong. 2026-08-26. Deformation theory of parabolic representation pairs. https://arxiv.org/abs/2509.20791

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