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Potential Automorphy of $\Widehat {G} $-Local Systems
Potential automorphy of G-local systems Jack A. Thorneb September 4, 2019 Abstract Vincent Lafforgue has recently made a spectacular breakthrough in the setting of the global Langlands correspondence for global fields of positive characteristic, by constructing the ‘automorphic–to–Galois’ direction of the correspondence for an arbitrary reductive group G. We discuss a result that starts with Lafforgue’s work and proceeds in the opposite (‘Galois– to–automorphic’) direction. 1 Introduction Let Fq be a finite field, and let G be a split reductive group over Fq. Let X be a smooth projective connected curve over Fq, and let K be its function field. Let AK denote the ring of ad`eles of K. Automorphic forms on G are locally constant functions f : G(AK ) → Q which are invariant under left translation 1 by the discrete group G(K) ⊂ G(AK ). The space of automorphic forms is a representation of G(AK ), and its irreducible constituents are called automorphic representations. Let ℓ ∤ q be a prime. According to the Langlands conjectures, any automor- phic representation π of G(AK ) should give rise to a continuous representation ´et ρ(π): π1 (U) → G(Qℓ) (for some open subscheme U ⊂ X). This should be com- patible with the (known) unramified local Langlands correspondence, which de- arXiv:1909.00655v1 [math.NT] 2 Sep 2019 b ´et scribes the pullback of ρ(π) to π1 (Fqv ) for every closed point v : Spec Fqv ֒→ U ′ in terms of the components πv of a factorization π = ⊗vπv into representations of the local groups G(Kv). -
Mathematical
2-12 JULY 2011 MATHEMATICAL HOST AND VENUE for Students Jacobs University Scientific Committee Étienne Ghys (École Normale The summer school is based on the park-like campus of Supérieure de Lyon, France), chair Jacobs University, with lecture halls, library, small group study rooms, cafeterias, and recreation facilities within Frances Kirwan (University of Oxford, UK) easy walking distance. Dierk Schleicher (Jacobs University, Germany) Alexei Sossinsky (Moscow University, Russia) Jacobs University is an international, highly selective, Sergei Tabachnikov (Penn State University, USA) residential campus university in the historic Hanseatic Anatoliy Vershik (St. Petersburg State University, Russia) city of Bremen. It features an attractive math program Wendelin Werner (Université Paris-Sud, France) with personal attention to students and their individual interests. Jean-Christophe Yoccoz (Collège de France) Don Zagier (Max Planck-Institute Bonn, Germany; › Home to approximately 1,200 students from over Collège de France) 100 different countries Günter M. Ziegler (Freie Universität Berlin, Germany) › English language university › Committed to excellence in higher education Organizing Committee › Has a special program with fellowships for the most Anke Allner (Universität Hamburg, Germany) talented students in mathematics from all countries Martin Andler (Université Versailles-Saint-Quentin, › Venue of the 50th International Mathematical Olympiad France) (IMO) 2009 Victor Kleptsyn (Université de Rennes, France) Marcel Oliver (Jacobs University, Germany) For more information about the mathematics program Stephanie Schiemann (Freie Universität Berlin, Germany) at Jacobs University, please visit: Dierk Schleicher (Jacobs University, Germany) math.jacobs-university.de Sergei Tabachnikov (Penn State University, USA) at Jacobs University, Bremen The School is an initiative in the framework of the European Campus of Excellence (ECE). -
Annual Report 2005-2006
CORNELL UNIVERSITY DEPARTMENT OF MATHEMATICS ANNUAL REPORT 2005–2006 The Department of Mathematics at Cornell University is known throughout the world for its distinguished faculty and stimulating mathematical atmosphere. Close to 40 tenured and tenure-track faculty represent a broad spectrum of current mathematical research, with a lively group of postdoctoral fellows and frequent research and teaching visitors. The graduate program includes over 70 graduate students from many different countries. The undergraduate program includes several math major programs, and the department offers a wide selection of courses for all types of users of mathematics. A private endowed university and the federal land-grant institution of New York State, Cornell is a member of the Ivy League and a partner of the State University of New York. There are approximately 19,500 students at Cornell’s Ithaca campus enrolled in seven undergraduate units and four graduate and professional units. Nearly 14,000 of those students are undergraduates, and most of those take at least one math course during their time at Cornell. The Mathematics Department is part of the College of Arts and Sciences, a community of 6,000 students and faculty in 50 departments and programs, encompassing the humanities, sciences, mathematics, fine arts, and social sciences. We are located in Malott Hall, in the center of the Cornell campus, atop a hill between two spectacular gorges that run down to Cayuga Lake in the beautiful Finger Lakes region of New York State. Department Chair: Prof. Kenneth Brown Director of Undergraduate Studies (DUS): Prof. Allen Hatcher Director of Graduate Studies (DGS): Prof. -
Joel Feldman
Essay‐Contest 2017/18 Lukas Lanik, International School Kufstein, 9. Schulstufe, Fremdsprachenerwerb: 5 Jahre Joel Feldman Physics, mathematics and computer science belong to my favourite subjects in school and are definitely sciences that I would like to study at university. That is why I think the work and research that Joel Feldman does is really interesting. He is a mathematician and a mathematical physicist. He did his bachelor’s degree in 1970 at the University of Toronto and his masters and PhD at Harvard University in 1971 and 1974. He has made important contributions to quantum field theory, many‐body theory, Schrödinger operator theory, the theory of infinite genus Riemann surfaces and on Fermi liquids. His research on Fermi liquids and infinite genus Riemann surfaces was done in collaboration with Horst Knörrer and Eugene Trubowitz. Over the years professor Feldman won many prizes because of his outstanding contributions in Mathematics and Theoretical Physics and is a part of the Royal Society of Canada. In 1996 he won the John L. Synge Award, in 2004 he won the Jeffery‐ Williams Prize and in 2007 he won the CRM‐Fields‐PIMS Prize together with CAP‐CRM in Theoretical and Mathematical Physics. But why are contributions to research in physics so important? How do they help to push humanity forward? Physics helps us understand the nature of the universe. It helps us understand why certain things work the way they work. Take, for example, the European robin. At first glance, it seems like an ordinary bird. But once we start asking how is it possible that during winter the bird is able to find its way to southern Europe and back, things start to get weird, because the answer to this question lies in the mysterious realm of quantum mechanics. -
Strength in Numbers: the Rising of Academic Statistics Departments In
Agresti · Meng Agresti Eds. Alan Agresti · Xiao-Li Meng Editors Strength in Numbers: The Rising of Academic Statistics DepartmentsStatistics in the U.S. Rising of Academic The in Numbers: Strength Statistics Departments in the U.S. Strength in Numbers: The Rising of Academic Statistics Departments in the U.S. Alan Agresti • Xiao-Li Meng Editors Strength in Numbers: The Rising of Academic Statistics Departments in the U.S. 123 Editors Alan Agresti Xiao-Li Meng Department of Statistics Department of Statistics University of Florida Harvard University Gainesville, FL Cambridge, MA USA USA ISBN 978-1-4614-3648-5 ISBN 978-1-4614-3649-2 (eBook) DOI 10.1007/978-1-4614-3649-2 Springer New York Heidelberg Dordrecht London Library of Congress Control Number: 2012942702 Ó Springer Science+Business Media New York 2013 This work is subject to copyright. All rights are reserved by the Publisher, whether the whole or part of the material is concerned, specifically the rights of translation, reprinting, reuse of illustrations, recitation, broadcasting, reproduction on microfilms or in any other physical way, and transmission or information storage and retrieval, electronic adaptation, computer software, or by similar or dissimilar methodology now known or hereafter developed. Exempted from this legal reservation are brief excerpts in connection with reviews or scholarly analysis or material supplied specifically for the purpose of being entered and executed on a computer system, for exclusive use by the purchaser of the work. Duplication of this publication or parts thereof is permitted only under the provisions of the Copyright Law of the Publisher’s location, in its current version, and permission for use must always be obtained from Springer. -
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Volume 47 • Issue 1 IMS Bulletin January/February 2018 National Academy new member The US National Academy of Medicine (NAM) has announced the election of 70 reg- CONTENTS ular members and 10 international members. Among them is Nicholas Patrick Jewell, 1 National Academy of University of California, Berkeley. Medicine elects Jewell Election to the Academy is considered one of the highest honors in the fields of 2 Members’ news: Nick Horton, health and medicine, recognizing individuals who have made major contributions to Eric Kolaczyk, Hongzhe Li, the advancement of the medical sciences, health care, and public health. A diversity Runze Li, Douglas Simpson, of talent among NAM’s membership is Greg Lawler, Mike Jordan, Mir assured by its Articles of Organization, Masoom Ali which stipulate that at least one-quarter 3 Journal news: EJP, ECP, Prob of the membership is selected from fields Surveys; OECD guidelines outside the health professions, for exam- 4 Takis Konstantopoulos: new ple, from law, engineering, social sciences, column and the humanities—and statistics. The newly elected members bring 6 Recent papers: Electronic Journal of Probability; Electronic NAM’s total membership to 2,127 and Communications in Probability the number of international members to 172. 11 Special Invited Lecturers; IMS Fellow Nicholas P. Jewell is New Textbook Professor of Biostatistics and Statistics 12 Obituary: Ron Getoor at the University of California, Berkeley. 13 IMS Awards Since arriving at Berkeley in 1981, he has held various academic and administrative 15 Student Puzzle Corner 19; New Researcher Award positions, most notably serving as Vice Provost from 1994 to 2000. -
View from the Chair
View from the Chair This past summer we initiated a major new program for John Imbrie research experiences for undergraduates (REUs), Professor of Mathematics/Chair combining Ken Ono's long-running program in number theory with a new program in geometry and topology, I write at the conclusion of an extraordinary year for our supported by the RTG grant. Despite the challenges of work- department. As 2020 began, we were gearing up to host the ing remotely, the program was very successful -- see the AMS sectional, which was to start on March 12. Early article below by Ken Ono and Tom Mark. Other indications were that large gatherings were a major highlights of this Virginia Math Bulletin include an article on contributor to the spread of the pandemic, so we hastily our new bridge program, by David Sherman (our new cancelled the event, which was to bring 700 participants to Director of Diversity, Equity, and Inclusion). Our Bridge to Charlottesville. Soon, the university cancelled classes and the Doctorate currently supports three students were abruptly sent post-baccalaureate students as they home. Faculty members and prepare for entry into a Ph.D. program. graduate students were tasked with quickly finding Sadly, it was impossible to conduct the a way to hold classes online. Gordon Keller math majors dinner. We The learning curve was had planned to host UVa graduate steep, but we came together and McShane Prize winner Adrew Booker, to reinvent our modes of who was in the news for work leading to teaching. Now we reach the the long-sought integer solutions to conclusion of a semester x3 + y3 + z3 = 33 and x3 + y3 + z3 = 42. -
Shtukas for Reductive Groups and Langlands Correspondence for Functions Fields
SHTUKAS FOR REDUCTIVE GROUPS AND LANGLANDS CORRESPONDENCE FOR FUNCTIONS FIELDS VINCENT LAFFORGUE This text gives an introduction to the Langlands correspondence for function fields and in particular to some recent works in this subject. We begin with a short historical account (all notions used below are recalled in the text). The Langlands correspondence [49] is a conjecture of utmost impor- tance, concerning global fields, i.e. number fields and function fields. Many excellent surveys are available, for example [39, 14, 13, 79, 31, 5]. The Langlands correspondence belongs to a huge system of conjectures (Langlands functoriality, Grothendieck’s vision of motives, special val- ues of L-functions, Ramanujan-Petersson conjecture, generalized Rie- mann hypothesis). This system has a remarkable deepness and logical coherence and many cases of these conjectures have already been es- tablished. Moreover the Langlands correspondence over function fields admits a geometrization, the “geometric Langlands program”, which is related to conformal field theory in Theoretical Physics. Let G be a connected reductive group over a global field F . For the sake of simplicity we assume G is split. The Langlands correspondence relates two fundamental objects, of very different nature, whose definition will be recalled later, • the automorphic forms for G, • the global Langlands parameters , i.e. the conjugacy classes of morphisms from the Galois group Gal(F =F ) to the Langlands b dual group G(Q`). b For G = GL1 we have G = GL1 and this is class field theory, which describes the abelianization of Gal(F =F ) (one particular case of it for Q is the law of quadratic reciprocity, which dates back to Euler, Legendre and Gauss). -
The Work of Wendelin Werner
The work of Wendelin Werner Charles M. Newman∗ 1. Introduction It is my great pleasure to briefly report on some of Wendelin Werner’s research ac- complishments that have led to his being awarded a Fields Medal at this International Congress of Mathematicians of 2006. There are a number of aspects of Werner’s work that add to my pleasure in this event. One is that he was trained as a probabilist, receiving his Ph.D. in 1993 under the supervision of Jean-François Le Gall in Paris with a dissertation concerning planar Brownian Motion – which, as we shall see, plays a major role in his later work as well. Until now, Probability Theory had not been represented among Fields Medals and so I am enormously pleased to be here to witness a change in that history. I myself was originally trained, not in Probability Theory, but in Mathematical Physics. Werner’s work, together with his collaborators such as Greg Lawler, Oded Schramm and Stas Smirnov, involves applications of Probablity and Conformal Map- ping Theory to fundamental issues in Statistical Physics, as we shall discuss. A second source of pleasure is my belief that this, together with other work of recent years, represents a watershed in the interaction between Mathematics and Physics generally. Namely, mathematicians such as Werner are not only providing rigorous proofs of already existing claims in the Physics literature, but beyond that are provid- ing quite new conceptual understanding of basic phenomena – in this case, a direct geometric picture of the intrinsically random structure of physical systems at their critical points (at least in two dimensions). -
Party Time for Mathematicians in Heidelberg
Mathematical Communities Marjorie Senechal, Editor eidelberg, one of Germany’s ancient places of Party Time HHlearning, is making a new bid for fame with the Heidelberg Laureate Forum (HLF). Each year, two hundred young researchers from all over the world—one for Mathematicians hundred mathematicians and one hundred computer scientists—are selected by application to attend the one- week event, which is usually held in September. The young in Heidelberg scientists attend lectures by preeminent scholars, all of whom are laureates of the Abel Prize (awarded by the OSMO PEKONEN Norwegian Academy of Science and Letters), the Fields Medal (awarded by the International Mathematical Union), the Nevanlinna Prize (awarded by the International Math- ematical Union and the University of Helsinki, Finland), or the Computing Prize and the Turing Prize (both awarded This column is a forum for discussion of mathematical by the Association for Computing Machinery). communities throughout the world, and through all In 2018, for instance, the following eminences appeared as lecturers at the sixth HLF, which I attended as a science time. Our definition of ‘‘mathematical community’’ is journalist: Sir Michael Atiyah and Gregory Margulis (both Abel laureates and Fields medalists); the Abel laureate the broadest: ‘‘schools’’ of mathematics, circles of Srinivasa S. R. Varadhan; the Fields medalists Caucher Bir- kar, Gerd Faltings, Alessio Figalli, Shigefumi Mori, Bào correspondence, mathematical societies, student Chaˆu Ngoˆ, Wendelin Werner, and Efim Zelmanov; Robert organizations, extracurricular educational activities Endre Tarjan and Leslie G. Valiant (who are both Nevan- linna and Turing laureates); the Nevanlinna laureate (math camps, math museums, math clubs), and more. -
Mathematical Tripos Part III Lecture Courses in 2013-2014
Mathematical Tripos Part III Lecture Courses in 2013-2014 Department of Pure Mathematics & Mathematical Statistics Department of Applied Mathematics & Theoretical Physics Notes and Disclaimers. • Students may take any combination of lectures that is allowed by the timetable. The examination timetable corresponds to the lecture timetable and it is therefore not possible to take two courses for examination that are lectured in the same timetable slot. There is no requirement that students study only courses offered by one Department. • The code in parentheses after each course name indicates the term of the course (M: Michaelmas; L: Lent; E: Easter), and the number of lectures in the course. Unless indicated otherwise, a 16 lecture course is equivalent to 2 credit units, while a 24 lecture course is equivalent to 3 credit units. Please note that certain courses are non-examinable, and are indicated as such after the title. Some of these courses may be the basis for Part III essays. • At the start of some sections there is a paragraph indicating the desirable previous knowledge for courses in that section. On one hand, such paragraphs are not exhaustive, whilst on the other, not all courses require all the pre-requisite material indicated. However you are strongly recommended to read up on the material with which you are unfamiliar if you intend to take a significant number of courses from a particular section. • The courses described in this document apply only for the academic year 2013-14. Details for subsequent years are often broadly similar, but not necessarily identical. The courses evolve from year to year. -
The Mathematical Work of the 2002 Fields Medalists, Volume 50
The Mathematical Work of the 2002 Fields Medalists Eric M. Friedlander, Michael Rapoport, and Andrei Suslin The Work of Laurent Lafforgue hand and of the idèle class group A×/F × on the Michael Rapoport other hand. This is the reciprocity law of T. Takagi Laurent Lafforgue was awarded the Fields Medal for and E. Artin established in the 1920s as a far-reach- his proof of the Langlands correspondence for the ing generalization of the quadratic reciprocity law general linear groups GLr over function fields of going back to L. Euler. At the end of the 1960s, positive characteristic. His approach to this prob- R. Langlands proposed a nonabelian generaliza- lem follows the basic strategy introduced twenty- tion of this reciprocity law. It conjecturally relates five years ago by V. Drinfeld in his proof for GL2. the irreducible representations of rank r of Gal(F/F¯ ) Already Drinfeld’s proof is extremely difficult. Laf- (or, more generally, of the hypothetical motivic forgue’s proof is a real tour de force, taking up as Galois group of F) with cuspidal automorphic rep- it does several hundred pages of highly condensed resentations of GL (A). In fact, this conjecture is reasoning. By his achievement Lafforgue has proved r part of an even grander panorama of Langlands (the himself a mathematician of remarkable strength functoriality principle), in which homomorphisms and perseverance. In this brief report I will sketch the background between L-groups of reductive groups over F induce of Lafforgue’s result, state his theorems, and then relations between the automorphic representations mention some ingredients of his proof.