An alternative zero-part formula for logarithmic double ramification intersections

Let dd be the degree, let ν\boldsymbol{\nu} be the ramification data, and let logDR0(d,ν)\operatorname{logDR}_0(d,-\boldsymbol{\nu}) denote the logarithmic double ramification cycle. Let ψ1\psi_1 be the cotangent-line class at the first marking and let branchm1e\operatorname{branch}_{m-1-e} be the corresponding branch class. Alternative zero-part formula. After inserting ν1=0\nu_1=0,

logDR0(d,ν)ψ1ebranchm1eν1=0=(m2)!(e+1)!j=e+1m1(djk2)j=0me2(djk2)(k/2).\int_{\operatorname{logDR}_0(d,-\boldsymbol{\nu})} \psi_1^{e}\cdot \operatorname{branch}_{m-1-e}\big|_{\nu_1=0} = \frac{(m-2)!}{(e+1)!}\cdot \frac{\prod_{j=e+1}^{m-1}(d-j\frac{k}{2}) -\prod_{j=0}^{m-e-2}(d-j\frac{k}{2}) }{(-k/2)}.

This is presented as an alternative form of the preceding conjectural zero-part formula, closer to its k=0k=0 specialization. It is therefore a restatement rather than a separate mathematical conjecture.

Sources & referencesView supporting material

Primary source

Renzo Cavalieri, Hannah Markwig and Johannes Schmitt, “One part leaky covers”, arXiv:2509.04335 (2025).

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