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BEGIN:VEVENT
SUMMARY:Allan Sly (Princeton University)
DTSTART:20210223T200000Z
DTEND:20210223T210000Z
DTSTAMP:20260422T225923Z
UID:SpecialColloquium/1
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/SpecialCollo
 quium/1/">Replica Symmetry Breaking for Random Regular NAESAT</a>\nby Alla
 n Sly (Princeton University) as part of Harvard Special Colloquium\n\nAbst
 ract: TBA\n
LOCATION:https://researchseminars.org/talk/SpecialColloquium/1/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ankur Moitra (MIT)
DTSTART:20210301T200000Z
DTEND:20210301T210000Z
DTSTAMP:20260422T225923Z
UID:SpecialColloquium/2
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/SpecialCollo
 quium/2/">Robustness Meets Algorithms</a>\nby Ankur Moitra (MIT) as part o
 f Harvard Special Colloquium\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/SpecialColloquium/2/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Melissa (Chiu-Chu) Liu (Columbia University)
DTSTART:20210308T200000Z
DTEND:20210308T210000Z
DTSTAMP:20260422T225923Z
UID:SpecialColloquium/3
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/SpecialCollo
 quium/3/">Topological Recursion and Enumerative Geometry</a>\nby Melissa (
 Chiu-Chu) Liu (Columbia University) as part of Harvard Special Colloquium\
 n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/SpecialColloquium/3/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jiang Ding (University of Pennsylvania\, Wharton)
DTSTART:20210316T190000Z
DTEND:20210316T200000Z
DTSTAMP:20260422T225923Z
UID:SpecialColloquium/4
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/SpecialCollo
 quium/4/">Recent progress on random field Ising model</a>\nby Jiang Ding (
 University of Pennsylvania\, Wharton) as part of Harvard Special Colloquiu
 m\n\n\nAbstract\nRandom field Ising model is a canonical example to study 
 the effect of disorder on long-range order. In 70's\, Imry-Ma predicted th
 at in the presence of weak disorder\, the long-range order persists at low
  temperatures in three dimensions and above but disappears in two dimensio
 ns. In this talk\, I will review mathematical development surrounding this
  prediction\, and I will focus on recent progress on exponential decay and
  on correlation length in two dimensions. The talk is based on a joint wor
 k with Jiaming Xia and a joint work with Mateo Wirth.\n
LOCATION:https://researchseminars.org/talk/SpecialColloquium/4/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Anna Gilbert (Yale University)
DTSTART:20210322T190000Z
DTEND:20210322T200000Z
DTSTAMP:20260422T225923Z
UID:SpecialColloquium/5
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/SpecialCollo
 quium/5/">Metric representations: Algorithms and Geometry</a>\nby Anna Gil
 bert (Yale University) as part of Harvard Special Colloquium\n\n\nAbstract
 \nGiven a data set or a set of distances amongst data points\, determining
  what combinatorial representation is most “consistent” with the input
  distances or the metric that best captures the relevant geometric feature
 s of the data is a key step in many machine learning algorithms. We seek s
 uch representations to gain new insights into the data generation process 
 or to uncover fundamental structures in the data (especially for scientifi
 c discovery). We may also seek representations that improve computational 
 efficiency.\n\nIn this talk\, we focus on a variety of metric representati
 on problems. The first three are specific metric constrained problems\, a 
 class of optimization problems with metric constraints: metric nearness\, 
 weighted correlation clustering on general graphs\, and metric learning. T
 he fourth problem is sparse metric repair\, a non-convex version of the me
 tric nearness problem. The final problem seeks a combinatorial representat
 ion of data sets in the form of trees or sparse graphs (which we then embe
 d into hyperbolic space).\n\nBecause of the large number of constraints in
  the metric constrained problems\, however\, these and other researchers h
 ave been forced to restrict either the kinds of metrics learned or the siz
 e of the problem that can be solved. We provide an algorithm\, PROJECT AND
  FORGET\, that uses Bregman projections with cutting planes\, to solve met
 ric constrained problems with many (possibly exponentially) inequality con
 straints.\n\nWe discuss the surprising features of the fourth problem\, sp
 arse metric repair problem\; in one setting it has a simple polynomial tim
 e solution and in the other settings\, it is fiendishly difficult. Finally
 \, we end with something different. We learn combinatorial structures rath
 er than metrics or data geometry. We then use those to embed the data sets
  into metric spaces.\n\nThis is joint work with a number of collaborators 
 and students: Rishi Sonthalia (Univ. of Michigan)\, Lalit Jain (Univ. of W
 ashington)\, Benjamin Raichel (Univ. of Texas-Dallas)\, and Greg van Buski
 rk (Univ. of Texas-Dallas).\n
LOCATION:https://researchseminars.org/talk/SpecialColloquium/5/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Michael Douglas (Stony Brook University)
DTSTART:20210614T190000Z
DTEND:20210614T200000Z
DTSTAMP:20260422T225923Z
UID:SpecialColloquium/6
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/SpecialCollo
 quium/6/">Topics in computers and mathematics</a>\nby Michael Douglas (Sto
 ny Brook University) as part of Harvard Special Colloquium\n\n\nAbstract\n
 Advances in computation and machine learning \nare changing the way we do 
 pure mathematics and theoretical physics.\nUsing examples from differentia
 l geometry\, finite group theory and other fields\,\nI will survey some di
 rections which I believe will have major impact during the coming decade: 
 machine learning\, ML inspired numerical methods\, computer assisted proof
 s and interactive theorem proving.\n\nRegistration is required to attend.\
 n
LOCATION:https://researchseminars.org/talk/SpecialColloquium/6/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lydia Bieri (University of Michigan)
DTSTART:20210525T190000Z
DTEND:20210525T200000Z
DTSTAMP:20260422T225923Z
UID:SpecialColloquium/7
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/SpecialCollo
 quium/7/">New Structures in Gravitational Waves</a>\nby Lydia Bieri (Unive
 rsity of Michigan) as part of Harvard Special Colloquium\n\n\nAbstract\nMa
 thematical General Relativity (GR) explores the structures and resulting d
 ynamics of gravitational systems. These are described by the Einstein equa
 tions\, which can be written as a system of nonlinear\, hyperbolic partial
  differential equations. Recent years have seen fruitful interactions betw
 een physical questions and geometric analysis\, sparking new breakthroughs
 \, in particular related to gravitational radiation. Gravitational waves t
 ransport information from faraway regions of the Universe. They were obser
 ved for the first time by Advanced LIGO in 2015. So far\, most studies in 
 GR have been devoted to sources like binary black hole mergers or generall
 y to sources that are stationary outside of a compact set. However\, when 
 extended neutrino halos are present\, the situation changes.  Mathematical
 ly\, we describe these systems by asymptotically-flat manifolds solving th
 e Einstein equations. In this talk\, I will present new results on gravita
 tional radiation for sources that are not stationary outside of a compact 
 set\, but whose gravitational fields fall off more slowly towards infinity
 . A panorama of new gravitational effects opens up when delving deeper int
 o these more general spacetimes. In particular\, whereas the former source
 s produce memory effects (permanent change of the spacetime) that are fini
 te and of purely electric parity\, the latter in addition generate memory 
 of magnetic type\, and both types grow. These new effects emerge naturally
  from the Einstein equations.\n
LOCATION:https://researchseminars.org/talk/SpecialColloquium/7/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sergei Gukov (Caltech)
DTSTART:20210601T190000Z
DTEND:20210601T200000Z
DTSTAMP:20260422T225923Z
UID:SpecialColloquium/8
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/SpecialCollo
 quium/8/">From Ramanujan to Rokhlin\, via quantum groups</a>\nby Sergei Gu
 kov (Caltech) as part of Harvard Special Colloquium\n\n\nAbstract\nIn this
  talk\, intended for a broad audience\, I will describe recent work on new
  q-series invariants of 3-manifolds labeled by Spin-C structures. While th
 e original motivation for studying these invariants is rooted in topology\
 , they exhibit a number of unexpected properties and connections to other 
 areas of mathematics\, e.g. turn out to be characters of logarithmic verte
 x algebras.\n
LOCATION:https://researchseminars.org/talk/SpecialColloquium/8/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Daniel Freed (University of Texas)
DTSTART:20210608T190000Z
DTEND:20210608T200000Z
DTSTAMP:20260422T225923Z
UID:SpecialColloquium/9
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/SpecialCollo
 quium/9/">The two-dimensional Ising model revisited</a>\nby Daniel Freed (
 University of Texas) as part of Harvard Special Colloquium\n\n\nAbstract\n
 I will describe joint work with Constantin Teleman\, in which we cast topo
 logical eyes on a well-studied system in condensed matter physics.  In par
 ticular\, we use the symmetry in a strong form and apply the technology of
  extended topological field theory.  We obtain a proof of duality\, constr
 uct a new dual theory for models based on a nonabelian group\, and make dy
 namical predictions.  The lecture will not assume any physics background.\
 n
LOCATION:https://researchseminars.org/talk/SpecialColloquium/9/
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