


The Geometry and Cohomology of Some Simple Shimura Varieties. (AM151) 
This book aims first to prove the local Langlands conjecture for GL_{n} over a padic field and, second, to identify the action of the decomposition group at a prime of bad reduction on the ladic cohomology of the "simple" Shimura varieties. These two problems go hand in hand. The results represent a major advance in algebraic number theory, finally proving the conjecture first proposed in Langlands's 1969 Washington lecture as a nonabelian generalization of local class field theory. The local Langlands conjecture for GL_{n}(K), where K is a padic field, asserts the existence of a correspondence, with certain formal properties, relating ndimensional representations of the Galois group of K with the representation theory of the locally compact group GL_{n}(K). This book constructs a candidate for such a local Langlands correspondence on the vanishing cycles attached to the bad reduction over the integer ring of K of a certain family of Shimura varieties. And it proves that this is roughly compatible with the global Galois correspondence realized on the cohomology of the same Shimura varieties. The local Langlands conjecture is obtained as a corollary. Certain techniques developed in this book should extend to more general Shimura varieties, providing new instances of the local Langlands conjecture. Moreover, the geometry of the special fibers is strictly analogous to that of Shimura curves and can be expected to have applications to a variety of questions in number theory. "...clearly and carefully written. In sum, it represents an aweinspiring achievement and is a model of good exposition."Bulletin of the American Mathematical Society, Volume 40, Number 2 Another Princeton book authored or coauthored by Michael Harris: Series:
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