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<p>We investigate the count of meromorphic differentials on the Riemann sphere possessing a single zero, multiple poles with prescribed orders and fixed residues at each pole. Gendron and Tahar previously examined this problem with respect to general residues using flat geometry, while Sugiyama approached it from the perspective of fixed point multipliers of polynomial maps in the case of simple poles. In our study, we employ intersection theory on compactified moduli spaces of differentials, enabling us to handle arbitrary residues and pole orders, which provides a complete solution to this problem. We also determine interesting combinatorial properties for the solution formula as well as related intersection numbers.</p>

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Counting differentials with fixed residues

  • 期刊论文

  • 发表日期：

    2025年5月18日

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  • Dawei Chen,
  • Miguel Prado

摘要

We investigate the count of meromorphic differentials on the Riemann sphere possessing a single zero, multiple poles with prescribed orders and fixed residues at each pole. Gendron and Tahar previously examined this problem with respect to general residues using flat geometry, while Sugiyama approached it from the perspective of fixed point multipliers of polynomial maps in the case of simple poles. In our study, we employ intersection theory on compactified moduli spaces of differentials, enabling us to handle arbitrary residues and pole orders, which provides a complete solution to this problem. We also determine interesting combinatorial properties for the solution formula as well as related intersection numbers.