A new D-level structure on parahoric torsors is introduced; its coresidue moment map yields a Poisson structure and an algebraically completely integrable Hamiltonian system that recovers Gaudin, KP solitons, and Calogero-Moser examples.
Tame parahoric nonabelian Hodge correspondence on curves
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abstract
The nonabelian Hodge correspondence for vector bundles over noncompact curves is adequately described by implementing a weighted filtration on the objects involved. In order to establish a full correspondence between a Dolbeault and a de Rham space for a general complex reductive group $G$, we introduce torsors given by parahoric group schemes in the sense of Bruhat--Tits. Combined with existing results on the Riemann--Hilbert correspondence for logarithmic parahoric connections, this gives a full nonabelian Hodge correspondence from Higgs bundles to fundamental group representations over a noncompact curve beyond the $\text{GL}_n(\mathbb{C})$-case.
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Level structures on parahoric torsors and complete integrability
A new D-level structure on parahoric torsors is introduced; its coresidue moment map yields a Poisson structure and an algebraically completely integrable Hamiltonian system that recovers Gaudin, KP solitons, and Calogero-Moser examples.