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arxiv: 1703.09864 · v1 · pith:SKIQTIGTnew · submitted 2017-03-29 · 🧮 math.AG · math.CV

Criterion for logarithmic connections with prescribed residues

classification 🧮 math.AG math.CV
keywords everyconnectionholomorphiclogarithmicresiduesadmitsassumptionatiyah
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A theorem of Weil and Atiyah says that a holomorphic vector bundle $E$ on a compact Riemann surface $X$ admits a holomorphic connection if and only if the degree of every direct summand of $E$ is zero. Fix a finite subset $S$ of $X$, and fix an endomorphism $A(x) \in \text{End}(E_x)$ for every $x \in S$. It is natural to ask when there is a logarithmic connection on $E$ singular over $S$ with residue $A(x)$ at every $x \in S$. We give a necessary and sufficient condition for it under the assumption that the residues $A(x)$ are rigid.

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