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We prove in generic situations that the lattice in a tame type induced by the completed cohomology of a
-arithmetic manifold is purely local, that is, only depends on the Galois representation at places above
. This is a generalization to
of the lattice conjecture of Breuil. In the process, we also prove the geometric Breuil–Mézard conjecture for (tamely) potentially crystalline deformation rings with Hodge–Tate weights
as well as the Serre weight conjectures of Herzig [‘The weight in a Serre-type conjecture for tame
-dimensional Galois representations’, Duke Math. J.149(1) (2009), 37–116] over an unramified field extending the results of Le et al. [‘Potentially crystalline deformation 3985 rings and Serre weight conjectures: shapes and shadows’, Invent. Math.212(1) (2018), 1–107]. We also prove results in modular representation theory about lattices in Deligne–Lusztig representations for the group
We prove a level raising mod
theorem for elliptic curves over
. It generalizes theorems of Ribet and Diamond–Taylor and also explains different sign phenomena compared to odd
. We use it to study the 2-Selmer groups of modular abelian varieties with common mod 2 Galois representation. As an application, we show that the 2-Selmer rank can be arbitrary in level raising families.
We compute the image of any choice of complex conjugation on the Galois representations associated to regular algebraic cuspidal automorphic representations and to torsion classes in the cohomology of locally symmetric spaces for
over a totally real field
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