The many-point Hecke-module presentation conjecture for tamely ramified Eisenstein series

Let SP1(Fq)S\subset\mathbb{P}^1(\mathbb{F}_q) be a nonempty finite set of tame ramification points, let CEisC_{Eis} be the corresponding Eisenstein Hecke module, and let HS\mathcal{H}^{\otimes S} be the tensor product of the local Hecke algebras. For sSs\in S, write JλsJ_\lambda^s for the translation operator associated with λΛ\lambda\in\Lambda, and write Avgsαs\mathrm{Avg}_{s_\alpha}^s for the averaging operator associated with a simple reflection sαWs_\alpha\in W. Many-point presentation conjecture. If ρ\rho is integral, then CEisC_{Eis} is the HS\mathcal{H}^{\otimes S}-module generated by Eis0\mathrm{Eis}_0 subject to

(JλpJλq)Eis0=0(J_\lambda^p-J_\lambda^q)\mathrm{Eis}_0=0

for every λΛ\lambda\in\Lambda and p,qSp,q\in S, and

(sS{p}AvgsαssS{q}Avgsαs)Eis0=0\left(\prod_{s\in S\setminus\{p\}}\mathrm{Avg}_{s_\alpha}^s-\prod_{s\in S\setminus\{q\}}\mathrm{Avg}_{s_\alpha}^s\right)\mathrm{Eis}_0=0

for every simple reflection sαWs_\alpha\in W and p,qSp,q\in S. This is the stated natural generalization to several tame ramification points; the supplied text does not establish it or indicate that it has been resolved.

Sources & referencesView supporting material

Primary source

Tahsin Saffat, “Hecke action on tamely ramified Eisenstein series over P^1”, arXiv:2309.11085 (2023).

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