The generalized L-function rigidity conjecture for pointed curves

Let (C,[M])(C,[M]) and (C,[M])(C',[M']) be smooth irreducible projective pointed curves over a finite field Fq{\mathbb F}_q. Let m,m{\mathfrak m},{\mathfrak m}' be moduli on C,CC,C' disjoint from M,MM,M' respectively. Suppose the corresponding generalized Jacobians JmJ_{{\mathfrak m}} and JmJ_{{\mathfrak m}'}' have dimension at least two, and that there is a set-theoretic map

ψ:Jm(Fq)Jm(Fq)\psi:J_{{\mathfrak m}'}'(\overline{{\mathbb F}}_q)\to J_{{\mathfrak m}}(\overline{{\mathbb F}}_q)

inducing an isomorphism of groups between Jm(Fqn)J_{{\mathfrak m}}({\mathbb F}_{q^n}) and Jm(Fqn)J_{{\mathfrak m}'}'({\mathbb F}_{q^n}) for every n1n\geq 1. The generalized L-function rigidity conjecture. If

L(T,CFqn,χ)=L(T,CFqn,χψJm(Fqn))L(T,C\otimes{\mathbb F}_{q^n},\chi)=L\bigl(T,C'\otimes{\mathbb F}_{q^n},\chi\circ\psi|_{J_{{\mathfrak m}'}'({\mathbb F}_{q^n})}\bigr)

for all nn and all characters χ\chi of Jm(Fqn)J_{{\mathfrak m}}({\mathbb F}_{q^n}), then CC and CC' are Frobenius twists of each other, and ψ\psi arises from a morphism of curves composed with a limit of Frobenius maps that sends MM to MM' and m{\mathfrak m} to m{\mathfrak m}'. This is a rigidity statement recovering the pointed curve and the geometric correspondence from all finite-field extensions and character LL-functions. The source states that the case m=(0){\mathfrak m}=(0) was proved, whereas the general modulus case is presented as the conjectural extension.

Sources & referencesView supporting material

Primary source

Jeremy Booher and José Felipe Voloch, “Recovering affine curves over finite fields from L-functions”, arXiv:2012.08683 (2021).

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