Isodual multiplicity-two tensor-product conjecture for rigid adelic spaces

Let (E,σ)(E,\sigma) be an isodual rigid adelic space over a number field KK with automorphism group GG. Assume that EE and EE^{\vee} are isomorphic as K[G]K[G]-modules, and that

E=i=1tViaiE=\bigoplus_{i=1}^t V_i^{a_i}

where the ViV_i are absolutely irreducible GG-modules and ai2a_i\leq 2. Isodual tensor-product conjecture. For every rigid analytic space FF,

Hmin(EF)=Hmin(E)Hmin(F).H_{\min}(E\otimes F)=H_{\min}(E)H_{\min}(F).

This is the proposed isodual counterpart of the multiplicity-free tensor-product theorem. The analogous description of invariant subspaces fails when multiplicities occur, so the conjecture remains unresolved under the stated multiplicity-two hypothesis.

Sources & referencesView supporting material

Primary source

Renaud Coulangeon, “On slopes of isodual lattices”, arXiv:2206.00331 (2022).

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