Doubly-periodic instanton via the ADHM method and the self-dual monopole-center vortex chain

Calorons, i.e., instantons on $\mathbb{R}^3\times S^1$, with nontrivial asymptotic holonomy decompose into $N$ fundamental monopole constituents. This suggests that a doubly-periodic Yang–Mills instanton on $\mathbb{R}^2\times T^2$ may admit a description in terms of a periodic array of monopole constituents. Starting from the Atiyah–Drinfeld–Hitchin–Manin (ADHM) construction, we derive the $2$d Abelian Hitchin system with impurities as a dual description of the doubly-periodic instanton. We then give a prescription for reconstructing the instanton from the Green's function of this system, assuming a scaling ansatz for the ultraviolet divergences induced by the delta-function impurities. In the far-field limit with strongly anisotropic torus periods, we extend the analysis of Bruckmann and van Baal for multi-calorons and identify an alternating chain of BPS and Kaluza–Klein (KK) monopole constituents: The monopole-center vortex chain arises from the non-Abelian self-dual field especially when an 't Hooft twist cuts the torus into the $1/N$ fragment.