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All Colloquia & Seminars

  1. Lorentzian geometric structures seminar: Chern—Simons invariant and Tholozan volume formula

    Location: MSRI: Baker Board Room
    Speakers: François Labourie (Université de Nice Sophia Antipolis)

    In his Thesis, Tholozan described a formula for the volume of a closed Anti de Sitter 3-manifold. As a consequence of this formula, the volume is (essentially) an integer. We will explain that one can recover the fact that this volume is an integer using the classical Chern—Simons theory.  Most of the talk will be devoted to a recap about Chern—Simons theory and its relation with gauge theory in 2, 3, and 4 dimensions.

    Updated on May 01, 2015 03:48 PM PDT
  1. DMS Research Seminar: Quasi-isometric rigidity of Teichmuller space

    Location: MSRI: Simons Auditorium
    Speakers: Howard Masur (University of Chicago)

    In the first part of the talk I will introduce the notion of a quasi-isometry between  metric spaces and  what it means for a space to be quasi-isometrically rigid. I will then give some history of this subject starting with Mostow strong rigidity and more recently, rigidity of the mapping class group.    I will then talk about Teichmuller space with the Teichmuller metric and state  some of the known properties of this metric that are useful for studying quasi-isometries.  In the second part of the talk I will discuss a recent joint theorem with Alex Eskin and Kasra Rafi where we prove Teichmuller space is quasi-isometrically rigid.

    Updated on Apr 30, 2015 04:57 PM PDT
  2. GAAHD Postdoc Seminar: Diophantine approximation in Lie groups

    Location: MSRI: Simons Auditorium
    Speakers: Nicolas de Saxce (Université de Paris XIII (Paris-Nord))

    We will study the diophantine properties of random finitely generated subgroups of Lie groups, focusing mainly on the case of nilpotent Lie groups.
     

    Updated on May 01, 2015 12:21 PM PDT
  3. Fibonacci Plays Billiards with Dr. Elwyn Berlekamp

    Location: MSRI: Simons Auditorium
    Speakers: Elwyn Berlekamp (University of California, Berkeley)

    Please join MSRIs Directorate for a fun talk led by Dr. Elwyn Berlekamp: 

    One version of the classic traveling salesman problem seeks to determine whether or not, in any given graph, there exists a "Hamiltonian path" which traverses every node exactly once.   In the general case, this problem is well-known to be NP Hard.   In one interesting subclass of this problem, the nodes are taken to be the first N integers, {1,2,3,...,N}, where there is a branch between J and K iff J+K is in a specified set S = {S[1], S[2], S[3],...,S[M]}.   Or, given S, for what values of N does a Hamiltonian path exist?  How fast can the elements of S grow such that there exist solutions for infinitely many N?
    The answer to the second question turns out to be a close relative of the Fibonacci numbers, for which we construct solutions by observing the path of a billiard ball which travels at 45 degree angles to the sides of its table.  Using the same billiard ball methodology, we also find some particular solutions when S is the set of squares or the set of cubes. 

    Created on Apr 30, 2015 09:42 AM PDT
  4. GAAHD Research Seminar

    Location: MSRI: Simons Auditorium
    Updated on Feb 20, 2015 09:52 AM PST
  5. Open ended seminar

    Location: MSRI: Baker Board Room
    Updated on Mar 06, 2015 09:50 AM PST
  6. DMS Research Seminar

    Location: MSRI: Simons Auditorium
    Speakers: Marc Burger (Eidgenössische TH Zürich-Hönggerberg), Fanny Kassel (Université de Lille I (Sciences et Techniques de Lille Flandres Artois))
    Updated on Jan 28, 2015 02:14 PM PST

Past Seminars

seminar
  1. Seminar 3-Manifold Seminar

    Created on Jan 29, 2015 09:29 AM PST
  2. Seminar 3-Manifold Seminar

    Created on Jan 29, 2015 09:28 AM PST
There are more then 30 past seminars. Please go to Past seminars to see all past seminars.