Weil's Conjecture for Function Fields

Released on by Dennis Gaitsgory
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  • Weil's Conjecture for Function Fields Book Detail

  • Author : Dennis Gaitsgory
  • Release Date : 2019-02-19
  • Publisher : Princeton University Press
  • Genre : Mathematics
  • Pages : 320
  • ISBN 13 : 0691182140
  • File Size : 82,82 MB
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Weil's Conjecture for Function Fields by Dennis Gaitsgory PDF Summary

Book Description: A central concern of number theory is the study of local-to-global principles, which describe the behavior of a global field K in terms of the behavior of various completions of K. This book looks at a specific example of a local-to-global principle: Weil’s conjecture on the Tamagawa number of a semisimple algebraic group G over K. In the case where K is the function field of an algebraic curve X, this conjecture counts the number of G-bundles on X (global information) in terms of the reduction of G at the points of X (local information). The goal of this book is to give a conceptual proof of Weil’s conjecture, based on the geometry of the moduli stack of G-bundles. Inspired by ideas from algebraic topology, it introduces a theory of factorization homology in the setting l-adic sheaves. Using this theory, Dennis Gaitsgory and Jacob Lurie articulate a different local-to-global principle: a product formula that expresses the cohomology of the moduli stack of G-bundles (a global object) as a tensor product of local factors. Using a version of the Grothendieck-Lefschetz trace formula, Gaitsgory and Lurie show that this product formula implies Weil’s conjecture. The proof of the product formula will appear in a sequel volume.

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