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  1. ; ; ; (, Journal of the European Mathematical Society)
    We study the weight part of Serre’s conjecture for genericn-dimensional modpGalois representations. We first generalize Herzig’s conjecture to the case where the field is ramified atpand prove the weight elimination direction of the conjecture. We then introduce a new class of weights associated ton-dimensional local modprepresentations which we callextremal weights. Using a “Levi reduction” property of certain potentially crystalline Galois deformation spaces, we prove the modularity of these weights. As a consequence, we deduce the weight part of Serre’s conjecture for unit groups of some division algebras in generic situations. 
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  2. ; (, Compositio Mathematica)
    Let$$G$$be a split reductive group over the ring of integers in a$$p$$-adic field with residue field$$\mathbf {F}$$. Fix a representation$$\overline {\rho }$$of the absolute Galois group of an unramified extension of$$\mathbf {Q}_p$$, valued in$$G(\mathbf {F})$$. We study the crystalline deformation ring for$$\overline {\rho }$$with a fixed$$p$$-adic Hodge type that satisfies an analog of the Fontaine–Laffaille condition for$$G$$-valued representations. In particular, we give a root theoretic condition on the$$p$$-adic Hodge type which ensures that the crystalline deformation ring is formally smooth. Our result improves on all known results for classical groups not of type A and provides the first such results for exceptional groups. 
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  3. ; ; ; (, Inventiones mathematicae)
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