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Journal of the American Mathematical Society

ISSN 1088-6834(online) ISSN 0894-0347(print)



Potentially semi-stable deformation rings

Author: Mark Kisin
Journal: J. Amer. Math. Soc. 21 (2008), 513-546
MSC (2000): Primary 11S20
Published electronically: September 20, 2007
MathSciNet review: 2373358
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Abstract: Let $K/\mathbb {Q}_p$ be a finite extension and $G_K$ the absolute Galois group of $K$. For $(A^{\circ }, \mathfrak {m})$ a complete local ring with finite residue and $V_{A^{\circ }}$ a finite free $A^{\circ }$-module equipped with an action of $G_K$ , we show that $A^{\circ }[1/p]$ has a maximal quotient over which the representation $V_{A^{\circ }}$ is semi-stable with Hodge-Tate weights in a given range. We show an analogous result for representations which are potentially semi-stable of fixed Galois type and $p$-adic Hodge type. If $V_{A^{\circ }}$ is the universal deformation of $V_{A^{\circ }}\otimes _{A^{\circ }} A^{\circ }/\mathfrak {m}$, then we compute the dimension of $A^{\circ }[1/p]$ and we show that these rings are sometimes smooth. Finally we apply this theory to show, in some new cases, the compatibility of the $p$-adic Galois representation attached to a Hilbert modular form with the local Langlands correspondence at $p$.

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Additional Information

Mark Kisin
Affiliation: Department of Mathematics, University of Chicago, Chicago, Illinois 60637
MR Author ID: 352758

Received by editor(s): April 13, 2006
Published electronically: September 20, 2007
Additional Notes: The author was partially supported by NSF grant DMS-0400666 and a Sloan Research Fellowship.
Article copyright: © Copyright 2007 American Mathematical Society
The copyright for this article reverts to public domain 28 years after publication.