Stratification of opers with apparent singularities and isomonodromic bubbling
This paper investigates Simpson's stratification of the de Rham moduli space of rank-2 flat connections on a compact Riemann surface by constructing explicit holomorphic families where colliding apparent singularities realize the closure relation between strata via isomonodromic bubbling surgery, with corresponding descriptions provided for Higgs bundles using Baker–Akhiezer divisors.
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