Functoriality of automorphic cLcL-invariants under base change

Let E/FE/F be the finite extension and let Sp(cpi)S_p(cpi) denote the relevant set of primes above pp. For a prime p~Sp(π)\tilde{\mathfrak{p}}\in S_p(\pi), let ep~e_{\tilde{\mathfrak{p}}} and fp~f_{\tilde{\mathfrak{p}}} be its ramification index and residue degree in EE, respectively, and let q\mathfrak{q} be a prime of EE above p~\tilde{\mathfrak{p}}. Base-change functoriality conjecture. One has

ep~fp~Lcyc(π,p~)=Lcyc(πE,q).e_{\tilde{\mathfrak{p}}}f_{\tilde{\mathfrak{p}}}\cdot \mathcal{L}^{\operatorname{cyc}}(\pi,\tilde{\mathfrak{p}})=\mathcal{L}^{\operatorname{cyc}}(\pi_E,\mathfrak{q}).

The assertion predicts the precise transformation of cyclotomic automorphic L\mathcal{L}-invariants under base change; the surrounding results establish related invariance statements under additional hypotheses, while the status of this formulation is not resolved in the supplied text.

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Primary source

Lennart Gehrmann, “Functoriality of automorphic L-invariants and applications”, arXiv:1704.00619 (2019).

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