The normalized period conjecture in categorical local Langlands

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Let GG) be a connected quasi-split reductive group over FF with a fixed Whittaker datum. Suppose there is a categorical equivalence

LG ⁣:Doc⁡(Bun⁡G,Q‾ℓ)≅IndCoh⁡(Par⁡LG).\mathbb{L}_G \colon {\mathcal{D}}^{\operatorname{oc}}({\operatorname{Bun}}_G, {\overline{\mathbb{Q}}_\ell}) \cong {\operatorname{IndCoh}}({\operatorname{Par}}_{{{}^LG}}).

For a dual pair (G,X)↔(LG,X^)(G,X)\leftrightarrow({{}^LG},\widehat{X}), the objects PXnorm⁡{\mathcal{P}}_X^{\operatorname{norm}} and LX^norm⁡{\mathcal{L}}_{\widehat{X}}^{\operatorname{norm}} are the normalized period and normalized LL-object, respectively. The normalized period conjecture. For every conjecturally defined dual pair (G,X)↔(LG,X^)(G, X) \leftrightarrow ({{}^LG}, \widehat{X}), one has

LG(PXnorm⁡)≅LX^norm⁡.\mathbb{L}_G({\mathcal{P}}_X^{\operatorname{norm}}) \cong {\mathcal{L}}_{\widehat{X}}^{\operatorname{norm}}.

This is the categorical translation of the normalized period conjecture in the setting of local Langlands; it is conditional on the existence of the stated categorical equivalence and on the definition of the relevant dual pairs.

References

Primary source

Yuta Takaya and Milton Lin, “Categorification of local relative Langlands duality”, arXiv:2601.02258 (2026).

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