The coupled equations imply alpha-K-polystability for triples

Let (X,L)(X,L) be a smooth compact polarized variety and let EE be a holomorphic vector bundle over XX of rank rr and degree zero. For positive coupling constants α0,α1R\alpha_0,\alpha_1\in\mathbb R, set α=rπ2α1α0\alpha=\frac{r\pi^2\alpha_1}{\alpha_0}. Let ωc1(L)\omega\in c_1(L) be a Kähler metric and HH a Hermitian metric on EE. The coupled-equations conjecture. If ω\omega and HH satisfy the coupled equations, then the triple (X,L,E)(X,L,E) is α\alpha-K-polystable. This conjecture is motivated by the Kempf–Ness framework and by results showing vanishing of the invariant for product test configurations and nonnegativity for base-preserving test configurations. The source notes that the limiting α0\alpha\to0 cscK case had been verified through work of Tian, Donaldson, Mabuchi and Stoppa.

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  1. The coupled equations imply alpha-K-polystability for triples

    Let (X,L,E)(X,L,E) be a smooth polarized variety and a holomorphic vector bundle over XX of rank rr and degree zero, where LL is ample. Let ωc1(L)\omega \in c_1(L) be a Kähler metric and let HH be a Hermitian metric on EE, with coupling constants α0,α1\alpha_0,\alpha_1 and α=rπ2α1α0\alpha=\frac{r\pi^2\alpha_1}{\alpha_0}. The coupled-equations conjecture. If ω\omega and HH satisfy the coupled equations, then the triple (X,L,E)(X,L,E) is α\alpha-K-polystable. This conjecture proposes an algebro-geometric obstruction to solutions of the coupled Kähler and Yang–Mills equations; the text gives supporting evidence from vanishing and nonnegativity of the associated invariant for product and base-preserving test configurations.

    source: Mario Garcia-Fernandez, “Coupled equations for Kähler metrics and Yang-Mills connections (Thesis)”, arXiv:1102.0985 (2011).

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Primary source

Mario Garcia-Fernandez, “Coupled equations for Kähler metrics and Yang-Mills connections (Thesis)”, arXiv:1102.0985 (2011).

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