Cohomology of Drinfeld Modular Varieties, Part 2, Automorphic Forms, Trace Formulas and Langlands Correspondence

This book follows the author's first volume on Drinfeld modular varieties, and is pitched at graduate students.

Gérard Laumon (Author), Jean Loup Waldspurger (Appendix by)

9780521109901, Cambridge University Press

Paperback / softback, published 30 April 2009

380 pages
22.9 x 15.2 x 2.1 cm, 0.56 kg

Cohomology of Drinfeld Modular Varieties provides an introduction, in two volumes, both to this subject and to the Langlands correspondence for function fields. These varieties are the analogues for function fields of the Shimura varieties over number fields. The Langlands correspondence is a conjectured link between automorphic forms and Galois representations over a global field. By analogy with the number-theoretic case, one expects to establish the conjecture for function fields by studying the cohomology of Drinfeld modular varieties, which has been done by Drinfeld himself for the rank two case. This second volume is concerned with the Arthur-Selberg trace formula, and with the proof in some cases of the Rmamanujan-Petersson conjecture and the global Langlands conjecture for function fields. It is based on graduate courses taught by the author, who uses techniques which are extensions of those used to study Shimura varieties. Though the author considers only the simpler case of function rather than number fields, many important features of the number field case can be illustrated. Several appendices on background material keep the work reasonably self-contained. It is the first book on this subject and will be of much interest to all researchers in algebraic number theory and representation theory.

Preface
9. Trace of fA on the discrete spectrum
10. Non-invariant Arthur trace formula: the geometric side
11. Non-invariant Arthur trace formula: the spectral side
12. Cohomology with compact supports of Drinfeld modular varieties
13. Intersection cohomology of Drinfeld modular varieties
Appendix D. Representations of unimodular, locally compact, totally discontinuous, separated topological groups: addendum
Appendix E. Reduction theory and strong approximation
Appendix F. Proof of lemma 10. 6. 4
Appendix G. The decomposition of L2G following the cuspidal data.

Subject Areas: Algebra [PBF]