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X-ORIGINAL-URL:https://cmsa.fas.harvard.edu
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DTSTART:20180311T070000
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TZOFFSETTO:-0400
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BEGIN:VEVENT
DTSTART;TZID=America/New_York:20190920T103000
DTEND;TZID=America/New_York:20190920T113000
DTSTAMP:20260523T062216
CREATED:20240212T102847Z
LAST-MODIFIED:20240212T102847Z
UID:10001984-1568975400-1568979000@cmsa.fas.harvard.edu
SUMMARY:9/20/2019 General Relativity Seminar
DESCRIPTION:
URL:https://cmsa.fas.harvard.edu/event/9-20-2019-general-relativity-seminar/
LOCATION:MA
CATEGORIES:Colloquia & Seminar,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20190919T143000
DTEND;TZID=America/New_York:20190919T160000
DTSTAMP:20260523T062216
CREATED:20240212T094800Z
LAST-MODIFIED:20240212T094800Z
UID:10001932-1568903400-1568908800@cmsa.fas.harvard.edu
SUMMARY:9/19/2019 Spacetime Seminar
DESCRIPTION:
URL:https://cmsa.fas.harvard.edu/event/9-19-2019-spacetime-seminar/
LOCATION:MA
CATEGORIES:Colloquia & Seminar,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20190918T163000
DTEND;TZID=America/New_York:20190918T173000
DTSTAMP:20260523T062216
CREATED:20240212T102253Z
LAST-MODIFIED:20240514T175908Z
UID:10001976-1568824200-1568827800@cmsa.fas.harvard.edu
SUMMARY:A taste of noncommutative convex algebraic geometry
DESCRIPTION:Speaker: Bill Helton (UC San Diego)\n\nTitle:  A taste of noncommutative convex algebraic geometry\n\nAbstract: The last decade has seen the development of a substantial noncommutative (in a free algebra) real and complex algebraic geometry. The aim of the subject is to develop a systematic theory of equations and inequalities for (noncommutative) polynomials or rational functions of matrix variables. Such issues occur in linear systems engineering problems\, in free probability (random matrices)\, and in quantum information theory. In many ways the noncommutative (NC) theory is much cleaner than classical (real) algebraic geometry. For example\,\n\n◦ A NC polynomial\, whose value is positive semidefinite whenever you plug matrices into it\, is a sum of squares of NC polynomials.\n◦ A convex NC semialgebraic set has a linear matrix inequality representation.\n◦ The natural Nullstellensatz are falling into place.\n\n The goal of the talk is to give a taste of a few basic results and some idea of how these noncommutative problems occur in engineering. The subject is just beginning and so is accessible without much background. Much of the work is joint with Igor Klep who is also visiting CMSA for the Fall of 2019.
URL:https://cmsa.fas.harvard.edu/event/9-18-2019-colloquium/
LOCATION:CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Colloquium
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/CMSA-Colloquium-09.12.19-791x1024-1.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20190918T150000
DTEND;TZID=America/New_York:20190918T160000
DTSTAMP:20260523T062216
CREATED:20240212T102025Z
LAST-MODIFIED:20240212T102025Z
UID:10001973-1568818800-1568822400@cmsa.fas.harvard.edu
SUMMARY:9/18/2019 Fluid Dynamics Seminar
DESCRIPTION:
URL:https://cmsa.fas.harvard.edu/event/9-18-2019-fluid-dynamics-seminar/
LOCATION:MA
CATEGORIES:Colloquia & Seminar,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20190918T103000
DTEND;TZID=America/New_York:20190918T120000
DTSTAMP:20260523T062216
CREATED:20240212T102513Z
LAST-MODIFIED:20240212T102513Z
UID:10001980-1568802600-1568808000@cmsa.fas.harvard.edu
SUMMARY:9/18/2019 Quantum Matter Seminar
DESCRIPTION:
URL:https://cmsa.fas.harvard.edu/event/9-18-2019-quantum-matter-seminar/
LOCATION:MA
CATEGORIES:Colloquia & Seminar,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20190916T120000
DTEND;TZID=America/New_York:20190916T130000
DTSTAMP:20260523T062216
CREATED:20240212T094504Z
LAST-MODIFIED:20240212T094504Z
UID:10001928-1568635200-1568638800@cmsa.fas.harvard.edu
SUMMARY:9/16/2019 Math-Physics Seminar
DESCRIPTION:
URL:https://cmsa.fas.harvard.edu/event/9-16-2019-math-physics-seminar/
LOCATION:MA
CATEGORIES:Colloquia & Seminar,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20190913T103000
DTEND;TZID=America/New_York:20190913T233000
DTSTAMP:20260523T062216
CREATED:20240212T095003Z
LAST-MODIFIED:20240212T095003Z
UID:10001935-1568370600-1568417400@cmsa.fas.harvard.edu
SUMMARY:9/13/2019 General Relativity
DESCRIPTION:
URL:https://cmsa.fas.harvard.edu/event/9-13-2019-general-relativity/
LOCATION:MA
CATEGORIES:Colloquia & Seminar,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20190912T173800
DTEND;TZID=America/New_York:20190912T173800
DTSTAMP:20260523T062216
CREATED:20240213T102851Z
LAST-MODIFIED:20240213T102851Z
UID:10002429-1568309880-1568309880@cmsa.fas.harvard.edu
SUMMARY:Spacetime and Quantum Mechanics Seminar
DESCRIPTION:As part of the program on Spacetime and Quantum Mechanics\, the CMSA will be hosting a weekly seminar on Thursdays at 2:30pm in room G10. \n\n\n\nDate\nSpeaker\nTitle/Abstract\n\n\n9/12/2019\nPasha Pylyavskyy (University of Minnesota)\nTitle: Vector-relation configurations and plabic graphs\n\n\n19/18/2019 \n2:00pm \nG02\nFrancis Brown (University of Oxford)\nTitle: Amplitudes\, Polylogs and Moduli Spaces\n\n\n9/19/2019\nChuck Doran (University of Alberta)\nTitle: Calabi-Yau geometry of the N-loop sunset Feynman integrals \nAbstract: I will present an overview of the algebraic and transcendental features of the computation of N-loop sunset Feynman integrals. \nStarting from the realization of arbitrary Feynman graph hypersurfaces as (generalized) determinantal varieties\, we describe the Calabi-Yau subvarieties of permutohedral varieties that arise from the N-loop sunset Feynman graphs and some key features of their geometry and moduli. \nThese include: (1) an iterated fibration structure which allows one to “bootstrap” both periods and Picard-Fuchs equations from lower N cases; (2) specialization to and interpretation of coincident mass loci (“jump loci”) in moduli; (3) a significant generalization of the Griffiths-Dwork algorithm via “creative telescoping”; and (4) the realization of Calabi-Yau pencils as Landau-Ginzburg models mirror to weak Fano varieties. \nDetails of each of these will be discussed in later lectures this semester. This is joint work with Pierre Vanhove and Andrey Novoseltsev.\n\n\n9/26/2019\nTomasz Taylor (Northeastern)\nTitle: Celestial Amplitudes\n\n\n10/3/2019\nSimon Caron-Huot (McGill)\nTitle: Poincare Duals of Feynman Integrals\n\n\n10/10/2019 \n3:30pm\nYutin Huang (National Taiwan University)\nTitle: Dualities of Planar Ising Networks and the Positive Orthogonal Grassmannian\n\n\n10/15/2019 \nTuesday \n3:30pm\n  \nSergey Fomin (Univ. of Michigan) \n \nTitle: “Morsifications and mutations” (joint work with P. Pylyavskyy\, E. Shustin\, and D. Thurston). \n\n\n10/18/2019 \nFriday  \nG02\nSebastian Franco (The City College of New York)\nTitle: Graded quivers\, generalized dimer models\, and topic geometry\n\n\n10/31/2019\nJunjie Rao (Albert Einstein Institute)\nTitle: All-loop Mondrian Reduction of 4-particle Amplituhedron at Positive Infinity\n\n\n11/1/2019 \nSC 232 \n1:30pm\nGeorge Lusztig (MIT)\nTitle: Total positivity in Springer fibres\n\n\n11/12/2019 \nTuesday \nG02 \n3:30pm\n  \nPierpaolo Mastrolia (University of Padova)\nTitle: Feynman Integrals and Intersection Theory\n\n\n11/14/2019 \nG02\nPierpaolo Mastrolia (University of Padova)\nTitle: Feynman Integrals and Intersection Theory Pt. II\n\n\n11/21/2019\nCristian Vergu (Niels Bohr Institute)\nTitle: The Octagonal Alphabet\n\n\n11/26/2019\nStephan Stieberger (IAS)\nTitle: Strings on the Celestial Sphere\n\n\n12/4/2019\nHadleigh Frost (Oxford)\nTitle: BCJ numerators\, $\mathcal{M}_{0\,n}$\, and ABHY \nAbstract: We relate the BCJ numerator Jacobi property to the classical fact that the top homology group of $\mathcal{M}_{0\,n}$ is isomorphic to a component of the free Lie algebra. We describe ways to get BCJ numerators\, and caution that the BCJ Jacobi property doesn’t imply the existence of what has been called a ‘kinematic algebra.’\n\n\n 12/5/2019\nDavid Kosower (IAS)\nTitle: From scattering amplitudes to classical observables\n\n\n12/10/2019\nRamis Movassagh (MIT)\nTitle: Highly entangled quantum spin chains: Exactly solvable counter-examples to the area law \nAbstract: In recent years\, there has been a surge of activities in proposing “exactly solvable” quantum spin chains with surprising high amount of ground state entanglement–exponentially more than the critical systems that have $\log(n)$ von Neumann entropy. We discuss these models from first principles. For a spin chain of length $n$\, we prove that the ground state entanglement entropy scales as $\sqrt(n)$ and in some cases even extensive (i.e.\, as $n$) despite the underlying Hamiltonian being: (1) Local (2) Having a unique ground state and (3) Translationally invariant in the bulk. These models have rich connections with combinatorics\, random walks\, Markov chains\, and universality of Brownian excursions. Lastly\, we develop techniques for proving the gap. As a consequence\, the gap of Motzkin and Fredkin spin chains are proved to vanish as 1/n^c with c>2; this rules out the possibility of these models to be relativistic conformal field theories in the continuum limit. Time permitting we will discuss more recent developments in this direction and ‘generic’ aspects of local spin chains.
URL:https://cmsa.fas.harvard.edu/event/spacetime-and-quantum-mechanics-seminar/
LOCATION:MA
CATEGORIES:Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20190912T143000
DTEND;TZID=America/New_York:20190912T160000
DTSTAMP:20260523T062216
CREATED:20240212T095136Z
LAST-MODIFIED:20240212T095136Z
UID:10001937-1568298600-1568304000@cmsa.fas.harvard.edu
SUMMARY:9/12/2019 Spacetime Seminar
DESCRIPTION:
URL:https://cmsa.fas.harvard.edu/event/9-12-2019-spacetime-seminar/
LOCATION:MA
CATEGORIES:Colloquia & Seminar,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20190911T134500
DTEND;TZID=America/New_York:20190911T144500
DTSTAMP:20260523T062216
CREATED:20240212T094226Z
LAST-MODIFIED:20240212T094226Z
UID:10001925-1568209500-1568213100@cmsa.fas.harvard.edu
SUMMARY:9/11/2019 Random Matrix
DESCRIPTION:
URL:https://cmsa.fas.harvard.edu/event/9-11-2019-random-matrix/
LOCATION:MA
CATEGORIES:Random Matrix & Probability Theory Seminar,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20190910T091500
DTEND;TZID=America/New_York:20190911T152500
DTSTAMP:20260523T062216
CREATED:20230707T174623Z
LAST-MODIFIED:20250328T144415Z
UID:10000118-1568106900-1568215500@cmsa.fas.harvard.edu
SUMMARY:Topology and Dynamics in Quantum Matter Workshop
DESCRIPTION:On September 10-11\, 2019\, the CMSA  hosted a second workshop on Topological Aspects of Condensed Matter. \nNew ideas rooted in topology have recently had a major impact on condensed matter physics\, and have led to new connections with high energy physics\, mathematics and quantum information theory.  The aim of this program will be to deepen these connections and spark new progress by fostering discussion and new collaborations within and across disciplines. \nTopics include i) the classification of topological states  ii) topological orders in two and three dimensions including quantum spin liquids\, quantum Hall states and fracton phases and iii)  interplay of symmetry and topology in quantum many body systems\, including symmetry protected topological phases\, symmetry fractionalization and anomalies iv) topological phenomena in quantum systems  driven far from equlibrium v) quantum field theory approaches to topological matter. \nThis workshop is part of the CMSA’s program on Program on Topological Aspects of Condensed Matter\, and is the second of two workshops\, in addition to a visitor program and seminars. \nThe workshop was held in room G10 of the CMSA\, located at 20 Garden Street\, Cambridge\, MA. \nOrganizers: Michael Hermele (CU Boulder) and Ashvin Vishwanath (Harvard) \nPartial list of speakers:\n\nNima Arkani-Hamed\, IAS\nJennifer Cano\, Stony Brook\nMeng Cheng\, Yale\nLukasz Fidkowski\, UW Seattle\nDaniel Freed\, Texas\nJeongwan Haah\, Microsoft Research\nAnton Kapustin\, Caltech\nZohar Komargodski\, SCGP/Stony Brook\nJohn McGreevy\, UC San Diego\nPrineha Narang\, Harvard\nYing Ran\, Boston College\nShinsei Ryu\, Chicago\nCumrun Vafa\, Harvard\nChong Wang\, Perimeter\nZhenghan Wang\, Microsoft Station Q\n\n 
URL:https://cmsa.fas.harvard.edu/event/topology-and-dynamics-in-quantum-matter-workshop-2/
LOCATION:CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Event,Workshop
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/Topology-Poster.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20190909T120000
DTEND;TZID=America/New_York:20190909T130000
DTSTAMP:20260523T062216
CREATED:20240212T093644Z
LAST-MODIFIED:20240212T093644Z
UID:10001921-1568030400-1568034000@cmsa.fas.harvard.edu
SUMMARY:9/9/2019 Math-Physics Seminar
DESCRIPTION:
URL:https://cmsa.fas.harvard.edu/event/9-9-2019-math-physics-seminar/
LOCATION:MA
CATEGORIES:Colloquia & Seminar,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20190901T090000
DTEND;TZID=America/New_York:20191220T170000
DTSTAMP:20260523T062216
CREATED:20230904T082838Z
LAST-MODIFIED:20250327T185837Z
UID:10000007-1567328400-1576861200@cmsa.fas.harvard.edu
SUMMARY:Spacetime and quantum mechanics\, total positivity and motives
DESCRIPTION:Recent developments have poised this area to make serious advances in 2019\, and we feel that bringing together many of the relevant experts for an intensive semester of discussions and collaboration will trigger some great things to happen. To this end\, the organizers will host a small workshop during Fall 2019\, with between 20-30 participants. They will also invite 10-20 longer-term visitors throughout the semester. Additionally\, there will be a seminar held weekly on Thursdays at 2:30pm in CMSA G10. \nOrganizers: \n\nNima Arkani-Hamed (IAS)\nLauren Williams (Harvard)\nAlexander Postnikov (MIT)\nThomas Lam (Michigan)\n\n. \nWorkshops: \n \n  \nSpacetime and Quantum Mechanics Workshop\, October 28-30\, 2019\n\n\nHere is a partial list of the mathematicians and physicists who have indicated that they will attend part or all of this special program as a visitor: \n\nPaolo Benincasa\, 11/17/2019 – 11/29/2019\nJacob Bourjaily\, 9/1/2019 – 12/15/2019\nFrancis Brown\, 9/15/2019 – 9/20/2019\nSimon Caron-Huot\, 9/30/2019 – 10/04/2019\nLance Dixon\, 9/9/2019 – 9/20/2019\nCharles Doran\, 10/19/2019 – 11/1/2019\nJames Drummond\, 10/14/2019 – 10/18/2019\nNick Early\, 11/18/2019 – 11/22/2019\nLivia Ferro\, 10/27/2019 – 11/9/2019\nSergey Fomin\, 10/6/2019 – 10/16/2019\nSebastian Franco\, 10/9/2019 – 10/19/2019\nHadleigh Frost\, 9/15/2019 – 12/20/2019\nMichael Green\, 10/05/2019 – 10/13/2019\nAlexander Goncharov\, 12/05/2019 – 12/20/2019\nSong He\, 9/29/2019 – 11/10/2019\nXuhua He\, 10/30/2019-11/03/2019\nEnrico Herrmann\, 10/27/2019 – 11/9/2019\nYutin Huang\, 9/30/2019 – 10/12/2019\nSteven Karp\, 10/11/2019 – 11/03/2019\nTomasz Lukowski\, 10/27/2019 – 11/11/2019\nAndrew McLeod\, 10/6/2019 – 10/19/2019 & 11/3/2019 – 11/16/2019\nSebastian Mizera\, 10/28/2019 – 11/1/2019\nErik Panzer\, 9/15/2019 – 9/25/2019\nMatteo Parisi\, 10/26/2019 – 11/10/2019\nJulio Parra-Martinez\, 10/10/2019 – 05/12/2019\n Pierpaolo Mastrolia\, 11/8/2019 – 11/16/2019\nPasha Pylyavskyy\, 9/8/2019 – 9/22/2019 & 10/14/2019 – 11/1/2019\nJunjie Rao\, 10/25/2019 – 11/04/2019\nGiulio Salvatori\, 9/3/2019 – 12/15/2019\nMichael Shapiro\, 10/27/2019 – 11/2/2019\nDavid Speyer\, 10/14/2019 – 10/18/2019\nHugh Thomas\, 10/27/2019 – 11/22/2019\nJaroslav Trnka\, 9/30/2019 – 10/04/2019\, 10/28/2019 – 11/01/2019\, 11/18/2019 – 11/22/2019\nCristian Vergu\, 11/10/2019 – 11/30/2019\nMatthias Volk\, 10/14/2019 – 10/25/2019\nMatthew von Hippel\, 11/11/2019 – 11/22/2019\nPierre Vanhove\, 10/22/2019 – 10/31/2019\nMatthias Wilhelm\, 10/14/2019 – 10/25/2019
URL:https://cmsa.fas.harvard.edu/event/spacetime-and-quantum-mechanics-total-positivity-and-motives/
LOCATION:CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Programs
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20190829T083000
DTEND;TZID=America/New_York:20190831T144500
DTSTAMP:20260523T062216
CREATED:20230707T174207Z
LAST-MODIFIED:20250328T144206Z
UID:10000117-1567067400-1567262700@cmsa.fas.harvard.edu
SUMMARY:Workshop on Foundations of Computational Science
DESCRIPTION:On August 29-31\, 2019 the Center of Mathematical Sciences and Applications  hosted a workshop on Foundations of Computational Science. The workshop was held in room G10 of the CMSA\, located at 20 Garden Street\, Cambridge\, MA.  This workshop was organized by David Xianfeng Gu. \nSpeakers: \n\nSarah Adel Bargal\, Boston University\nJianfeng Chen\, Harvard\nTat Seng Chua\, National University of Singapore\nKe Deng\, Tsinghua\nDavid Xianfeng Gu\, Stony Brook\nYike Guo\, Imperial College London\nMinlie Huang\, Tsinghua\nScott Kominers\, Harvard\nBrian Kulis\, Boston University\nWee Sun Lee\, National University of Singapore\nQianxiao Li\, National University of Singapore\nHanzhong Liu\, Tsinghua\nJun Liu\, Harvard\nXiao-Li Meng\, Harvard\nCengiz Pehlevan\, Harvard\nDonald Rubin\, Harvard\nSuproteem Sarkar\, Harvard\nZuowei Shen\, National University of Singapore\nYuanchun Shi\, Tsinghua\nJustin Solomon\, MIT\nHang Su\, Tsinghua\nMaosong Sun\, Tsinghua\nMirac Suzgun\, Harvard\nSergiy Verstyuk\, CMSA\nXiaoqin Wang\, Tsinghua\nBin Xu\, Tsinghua\nJun Zhu\, Tsinghua\nWenwu Zhu\, Tsinghua
URL:https://cmsa.fas.harvard.edu/event/workshop-on-foundations-of-computational-science/
LOCATION:CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Event,Workshop
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/AI-Poster-3.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20190819T083000
DTEND;TZID=America/New_York:20190820T164000
DTSTAMP:20260523T062216
CREATED:20230707T174003Z
LAST-MODIFIED:20250328T145128Z
UID:10000116-1566203400-1566319200@cmsa.fas.harvard.edu
SUMMARY:2019 Big Data Conference
DESCRIPTION:On August 19-20\, 2019 the CMSA hosted the fifth annual Conference on Big Data. The Conference will featured many speakers from the Harvard community as well as scholars from across the globe\, with talks focusing on computer science\, statistics\, math and physics\, and economics. \nThe talks will take place in Science Center Hall D\, 1 Oxford Street. \nVideos can be found in the Youtube playlist.
URL:https://cmsa.fas.harvard.edu/event/2019-big-data-conference/
LOCATION:CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Big Data Conference,Conference,Event
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/Big-Data-2019-Poster-5-2.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20190528T103000
DTEND;TZID=America/New_York:20190528T114200
DTSTAMP:20260523T062217
CREATED:20240212T101901Z
LAST-MODIFIED:20240212T101901Z
UID:10001970-1559039400-1559043720@cmsa.fas.harvard.edu
SUMMARY:5/28/2019 Topological Aspects of Condensed Matter Special Seminar
DESCRIPTION:
URL:https://cmsa.fas.harvard.edu/event/5-28-2019-topological-aspects-of-condensed-matter-special-seminar/
LOCATION:MA
CATEGORIES:Colloquia & Seminar,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20190522T150000
DTEND;TZID=America/New_York:20190522T160000
DTSTAMP:20260523T062217
CREATED:20240212T101645Z
LAST-MODIFIED:20240212T101645Z
UID:10001966-1558537200-1558540800@cmsa.fas.harvard.edu
SUMMARY:5/22/2019 Fluid Dynamics Seminar
DESCRIPTION:
URL:https://cmsa.fas.harvard.edu/event/5-22-2019-fluid-dynamics-seminar/
LOCATION:MA
CATEGORIES:Colloquia & Seminar,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20190515T150000
DTEND;TZID=America/New_York:20190515T160000
DTSTAMP:20260523T062217
CREATED:20240212T101402Z
LAST-MODIFIED:20240212T101402Z
UID:10001964-1557932400-1557936000@cmsa.fas.harvard.edu
SUMMARY:5/15/2019 Fluid Dynamics
DESCRIPTION:
URL:https://cmsa.fas.harvard.edu/event/5-15-2019-fluid-dynamics/
LOCATION:MA
CATEGORIES:Colloquia & Seminar,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20190506T120000
DTEND;TZID=America/New_York:20190506T130000
DTSTAMP:20260523T062217
CREATED:20240212T101125Z
LAST-MODIFIED:20240212T101125Z
UID:10001962-1557144000-1557147600@cmsa.fas.harvard.edu
SUMMARY:5/6/2019 Math Physics
DESCRIPTION:
URL:https://cmsa.fas.harvard.edu/event/5-6-2019-math-physics/
LOCATION:MA
CATEGORIES:Colloquia & Seminar,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20190502T090000
DTEND;TZID=America/New_York:20190505T170000
DTSTAMP:20260523T062217
CREATED:20230715T175235Z
LAST-MODIFIED:20250328T145104Z
UID:10000115-1556787600-1557075600@cmsa.fas.harvard.edu
SUMMARY:Conference on Differential Geometry\, Calabi-Yau theory and General Relativity: A conference in honor of the 70th Birthday of Shing-Tung Yau
DESCRIPTION:On May 2-5\, 2019 the Harvard Mathematics Department hosted a Conference on Differential Geometry\, Calabi-Yau Theory and General Relativity: A conference in honor of the 70th Birthday of Shing-Tung Yau. The conference was held in the  Science Center\, Lecture Hall C.  \nOrganizers:\n\nHorng-Tzer Yau (Harvard)\nWilfried Schmid (Harvard)\nClifford Taubes (Harvard)\nCumrun Vafa (Harvard)\n\nSpeakers:\n\nLydia Bieri\, University of Michigan\nTristan Collins\, MIT\nSimon Donaldson\, Imperial College\nFan Chung Graham\, UC San Diego\nNigel Hitchin\, Oxford University\nJun Li\, Stanford University\nKefeng Liu\, UCLA\nChiu-Chu Melissa Liu\, Columbia University\nAlina Marian\, Northeastern University\nXenia de la Ossa\, Oxford University\nDuong H. Phong\, Columbia University\nRichard Schoen\, UC Irvine\nAndrew Strominger\, Harvard University\nNike Sun\, MIT\nClifford Taubes\, Harvard University\nChuu-Lian Terng\, UC Irvine\nValentino Tosatti\, Northwestern University\nKaren Uhlenbeck\, University of Texas\nCumrun Vafa\, Harvard University\nMu Tao Wang\, Columbia University\nEdward Witten\, IAS\nStephen Yau\, Tsinghua University\, P.R. China
URL:https://cmsa.fas.harvard.edu/event/conference-on-differential-geometry-calabi-yau-theory-and-general-relativity-a-conference-in-honor-of-the-70th-birthday-of-shing-tung-yau/
LOCATION:Harvard Science Center\, 1 Oxford Street\, Cambridge\, MA\, 02138
CATEGORIES:Conference,Event
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/Yau-2-2-791x1024-2.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20190501T150000
DTEND;TZID=America/New_York:20190501T160000
DTSTAMP:20260523T062217
CREATED:20240212T095341Z
LAST-MODIFIED:20240212T095341Z
UID:10001940-1556722800-1556726400@cmsa.fas.harvard.edu
SUMMARY:5/1/2019 Fluid Dynamics Seminar
DESCRIPTION:
URL:https://cmsa.fas.harvard.edu/event/5-1-2019-fluid-dynamics-seminar/
LOCATION:MA
CATEGORIES:Colloquia & Seminar,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20190429T120000
DTEND;TZID=America/New_York:20190429T130000
DTSTAMP:20260523T062217
CREATED:20240212T101021Z
LAST-MODIFIED:20240212T101021Z
UID:10001961-1556539200-1556542800@cmsa.fas.harvard.edu
SUMMARY:4/29/2019 Mathematical Physics Seminar
DESCRIPTION:
URL:https://cmsa.fas.harvard.edu/event/4-29-2019-mathematical-physics-seminar/
LOCATION:MA
CATEGORIES:Colloquia & Seminar,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20190429T103000
DTEND;TZID=America/New_York:20190429T120000
DTSTAMP:20260523T062217
CREATED:20240216T102720Z
LAST-MODIFIED:20240503T152546Z
UID:10002764-1556533800-1556539200@cmsa.fas.harvard.edu
SUMMARY:4/29/2019 Quantum Matter seminar
DESCRIPTION:
URL:https://cmsa.fas.harvard.edu/event/4-29-2020-quantum-matter-seminar-2/
LOCATION:MA
CATEGORIES:Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20190429T090000
DTEND;TZID=America/New_York:20190501T170000
DTSTAMP:20260523T062217
CREATED:20230715T174721Z
LAST-MODIFIED:20250304T214254Z
UID:10000114-1556528400-1556730000@cmsa.fas.harvard.edu
SUMMARY:Conference on Algebraic Geometry\, Representation theory and Mathematical Physics
DESCRIPTION:From April 29 to May 1\, 2019 the CMSA will be hosting a Conference on Algebraic Geometry\, Representation theory and Mathematical Physics. This workshop is organized by Bong Lian (Brandeis) and Artan Sheshmani (CMSA) . The workshop will be held in room G10 of the CMSA\, located at 20 Garden Street\, Cambridge\, MA.   \nVideos\nSpeakers: \n\nDan Abramovich\, Brown\nRoman Bezrukavnikov\, MIT\nFedor Bogomolov\, NYU\nQile Chen\, Boston College\nDawei Chen\, Boston College\nAlexander Efimov\, Moscow\nPavel Etingof\, MIT\nMaksym Fedorchuk\, Boston College\nDennis Gaitsgory\, Harvard\nAmin Gholampour\, Maryland\nBrendan Hassett\, Brown\nLudmil Katzarkov\, Miami & Moscow\nSi Li\, Tsinghua\nAndrei Negut\, MIT\nYuri Tschinkel\, NYU\nWei Zhang\, MIT\n\n  \nMonday\, April 29 \n\n\n\nTime\nSpeaker\nTitle/Abstract\n\n\n8:30 – 9:00am\nBreakfast\n\n\n\n9:00 – 10:00am\nWei Zhang\, MIT\nTitle: The arithmetic fundamental lemma for diagonal cycles \nAbstract: I’ll recall the Gross–Zagier theorem and a high dimensional generalization\, the arithmetic Gan-Gross-Prasad conjecture\, which relates the height pairing of arithmetic diagonal cycles on certain shimura varieties to the first order derivative of certain L-functions.  The arithmetic fundamental lemma conjecture arises from the relative trace formula approach to this conjecture. I will recall the statement of the arithmetic fundamental lemma and outline a proof.\n\n\n10:00 – 10:30am\nBreak\n\n\n\n10:30 – 11:30am\nYuri Tschinkel\, NYU\nTitle: Equivariant birational geometry and modular symbols \nAbstract: We introduce new invariants in equivariant birational geometry and study their relation to modular symbols and cohomology of arithmetic groups (joint with M. Kontsevich and V. Pestun).\n\n\n11:30 – 1:30pm\nLunch\n\n\n\n1:30 – 2:30pm\nAlexander Efimov\, Moscow\nTitle: Torsionness for regulators of canonical extensions \nAbstract: I will sketch a generalization of the results of Iyer and Simpson arXiv:0707.0372 to the general case of a normal-crossings divisor at infinity.\n\n\n2:30 – 3:00pm\nBreak\n\n\n\n3:00 – 4:00pm\nAmin Gholampour\, Maryland\nTitle: Euler Characteristics of punctual quot schemes on threefolds \nAbstract: Let F be a homological dimension 1 torsion free sheaf on a nonsingular quasi-projective threefold. The first cohomology of the derived dual of F is a 1-dimension sheaf G supported on the singular locus of F. We prove a wall-crossing formula relating the generating series of the Euler characteristics of Quot(F\, n) and Quot(G\,n)\, where Quot(-\,n) denotes the quot scheme of length n quotients. We will use this relation in studying the Euler characteristics of the moduli spaces of stable torsion free sheaves on nonsingular projective threefolds. This is a joint work with Martijn Kool.\n\n\n4:00 – 4:30pm\nBreak\n\n\n\n4:30 – 5:30pm\nMaksym Fedorchuck\, BC\nTitle:  Stability of one-parameter families of weighted hypersurfaces \nAbstract:  We define a notion of stability for fibrations over a curve with generic fibers being weighted hypersurfaces (in some weighted projective space) generalizing Kollár’s stability for families of hypersurfaces in a projective space.  The stability depends on a choice of an effective line bundle on the parameter space of weighted hypersurfaces and different choices pick out different birational model of the total space of the fibration. I will describe enumerative geometry that goes into understanding these stability conditions\, and\, if time permits\, examples where this machinery can be used to produce birational models with good properties.  Joint work with Hamid Ahmadinezhad and Igor Krylov.\n\n\n\n  \nTuesday\, April 30 \n\n\n\nTime\nSpeaker\nTitle/Abstract\n\n\n8:30 – 9:00am\nBreakfast\n\n\n\n9:00 – 10:00am\nBrendan Hassett\, Brown\nTitle: Rationality for geometrically rational threefolds \nAbstract: We consider rationality questions for varieties over non-closed fields that become rational over an algebraic closure\, like smooth complete intersections of two quadrics.  (joint with Tschinkel)\n\n\n10:00 – 10:30am\nBreak\n\n\n\n10:30 – 11:30am\nDennis Gaitsgory\, Harvard\nTitle: The Fundamental Local Equivalence in quantum geometric Langlands \nAbstract: The Fundamental Local Equivalence is statement that relates the q-twisted  Whittaker category of the affine Grassmannian for the group G and the category of modules over the Langlands dual “big” quantum group. The non-triviaiity of the statement lies is the fact that the relationship between the group and its  dual is combinatorial\, so to prove the FLE one needs to express both sides in combinatorial terms. In the talk we will indicate the proof of a related statement for the “small” quantum group. The combinatorial link is provided by the category of factorization modules over a certain factorization algebra\, which in itself is a geometric device that concisely encodes the root data.\n\n\n11:30 – 1:00pm\nLunch\n\n\n\n1:00- 2:00pm\nAndrei Negut\, MIT\nTitle: AGT relations in geometric representation theory \nAbstract: I will survey a program that seeks to translate the Alday-Gaiotto-Tachikawa correspondence (between gauge theory on R^4 and conformal field theory) into the language of algebraic geometry. The objects of study become moduli spaces of sheaves on surfaces\, and the goal is to connect them with the W-algebra of type gl_n.\n\n\n2:00 – 2:15pm\nBreak\n\n\n\n2:15 – 3:15pm\nDan Abramovich\, Brown\nTitle: Resolution in characteristic 0 using weighted blowing up \nAbstract: Given a variety $X$\, one wants to blow up the worst singular locus\, show that it gets better\, and iterate until the singularities are resolved. \nExamples such as the whitney umbrella show that this iterative process cannot be done by blowing up smooth loci – it goes into a loop. \nWe show that there is a functorial way to resolve varieties using \emph{weighted} blowings up\, in the stack-theoretic sense. To an embedded variety $X \subset Y$ one functorially assigns an invariant $(a_1\,\ldots\,a_k)$\, and a center locally of the form $(x_1^{a_1} \, \ldots \, x_k^{a_k})$\, whose stack-theoretic weighted blowing up has strictly smaller invariant under the lexicographic order. \nThis is joint work with Michael Tëmkin (Jerusalem) and Jaroslaw Wlodarczyk (Purdue)\, a side product of our work on functorial semistable reduction. A similar result was discovered by G. Marzo and M. McQuillan.\n\n\n3:15 – 3:30pm\nBreak\n\n\n\n3:30 – 4:30pm\nFedor Bogomolov\, NYU\nTitle: On the base of a Lagrangian fibration for a compact hyperkahler manifold. \nAbstract: In my talk I will discuss our proof with N. Kurnosov that the base of such fibration for complex projective manifold hyperkahler manifold of dimension $4$ is always a projective plane $P^2$. In fact we show that the base of such fibration can not have a singular point of type $E_8$. It was by the theorem of Matsushita and others that only quotient singularities can occur and if the base is smooth then the it is isomorphic to $P^2$. The absence of other singularities apart from $E_8$ has been already known and we show that $E-8$ can not occur either. Our method can be applied to other types of singularities for the study of  Lagrangian fibrations in higher dimensions More recently similar result was obtained by Huybrechts and Xu.\n\n\n4:30 – 4:45pm\nBreak\n\n\n\n4:45 – 5:45pm\nDawei Chen\, BC\nTitle: Volumes and intersection theory on moduli spaces of Abelian differentials \nAbstract: Computing volumes of moduli spaces has significance in many fields. For instance\, Witten’s conjecture regarding intersection numbers on moduli spaces of Riemann surfaces has a fascinating connection to the Weil-Petersson volume\, which motivated Mirzakhani to give a proof via Teichmueller theory\, hyperbolic geometry\, and symplectic geometry. In this talk I will introduce an analogue of Witten’s intersection numbers on moduli spaces of Abelian differentials to compute the Masur-Veech volumes induced by the flat metric associated with Abelian differentials. This is joint work with Moeller\, Sauvaget\, and Zagier (arXiv:1901.01785).\n\n\n\n  \nWednesday\, May 1 \n\n\n\nTime\nSpeaker\nTitle/Abstract\n\n\n8:30 – 9:00am\nBreakfast\n\n\n\n9:00 – 10:00am\nPavel Etingof\, MIT\nTitle: Short star-products for filtered quantizations \nThis is joint work with Eric Rains and Douglas Stryker.\n\n\n10:00 – 10:30am\nBreak\n\n\n\n10:30 – 11:30am\nRoman Bezrukavnikov\, MIT\nTitle: Stability conditions and representation theory \nAbstract: I will recall the concept of real variation of stabilities (introduced in my work with Anno and Mirkovic)\nand its relation to modular Lie algebra representations. I will also address a potential generalization of that picture\nto modular representations of affine Lie algebras related to the classical limit of geometric Langlands duality and its local counterpart.\n\n\n11:30 – 11:45am\nBreak\n\n\n\n11:45 – 12:45pm\nQile Chen\, BC\nTitle: Counting curves in critical locus via logarithmic compactification \nAbstract: An R-map consists of a pre-stable map to possibly non-GIT quotient together with sections of certain spin bundles. The moduli of R-maps are in general non-compact. When the target of R-maps is equipped with a super-potential W with compact critical locus\, using Kiem-Li cosection localization it has been proved by many authors in various settings that the virtual cycle of R-maps can be represented by the cosection localized virtual cycle which is supported on the proper locus consisting of R-maps in the critical locus of W. Though the moduli of R-maps is equipped with a natural torus action by scaling of the spin bundles\, the non-compactness of the R-maps moduli makes such powerful torus action useless. \nIn this talk\, I will introduce a logarithmic compactification of the moduli of R-maps using certain modifications of stable logarithmic maps. The logarithmic moduli space carries a canonical virtual cycle from the logarithmic deformation theory. In the presence of a super-potential with compact critical locus\, it further carries a reduced virtual cycle. We prove that (1) the reduced virtual cycle of the compactification can be represented by the cosection localized virtual cycle; and (2) the difference of the canonical and reduced virtual cycles is another reduced virtual cycle supported along the logarithmic boundary. As an application\, one recovers the Gromov-Witten invariants of the critical locus as the invariants of logarithmic R-maps of its ambient space in an explicit form. The latter can be calculated using the spin torus action. \nThis is a joint work with Felix Janda and Yongbin Ruan.\n\n\n12:45 – 2:30pm\nLunch\n\n\n\n2:30 – 3:30pm\nSi Li\, Tsinghua\nTitle: Semi-infinite Hodge structure: from BCOV theory to Seiberg-Witten geometry \nAbstract: I will explain how the semi-infinite Hodge theory extends Kodaira-Spencer gravity (Bershadsky-Cecotti-Ooguri-Vafa theory of B-twisted closed topological string field theory) into a full solution of Batalin-Vilkovisky master equation. This allows us to formulate quantum B-model via a rigorous BV quantization method and construct integrable hierarchies arising naturally from the background symmetry. In the second part of the talk\, I will explain the recent discovery of the connection between K.Saito’s primitive form and 4d N=2 Seiberg-Witten geometry arising from singularity theory.\n\n\n3:30 – 4:00pm\nBreak\n\n\n\n4:00 – 5:00pm\nLudmil Katzarkov\, Moscow\nTitle: PDE’s non commutative  motives and HMS. \nAbstract: In this talk we will discuss the theory of central manifolds and the new structures in geometry it produces. Application to Bir.  Geometry will be discussed.\n\n\n\n 
URL:https://cmsa.fas.harvard.edu/event/conference-on-algebraic-geometry-representation-theory-and-mathematical-physics/
LOCATION:CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Conference,Event
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/algebraic-geo-conference-final-795x1024-1-1.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20190426T143000
DTEND;TZID=America/New_York:20200426T153000
DTSTAMP:20260523T062217
CREATED:20240212T100818Z
LAST-MODIFIED:20240221T092817Z
UID:10001958-1556289000-1587915000@cmsa.fas.harvard.edu
SUMMARY:4/26/2019 General Relativity Seminar
DESCRIPTION:
URL:https://cmsa.fas.harvard.edu/event/4-26-2019-general-relativity-seminar/
LOCATION:MA
CATEGORIES:General Relativity Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20190426T103000
DTEND;TZID=America/New_York:20190426T124000
DTSTAMP:20260523T062217
CREATED:20240212T095611Z
LAST-MODIFIED:20240212T095611Z
UID:10001944-1556274600-1556282400@cmsa.fas.harvard.edu
SUMMARY:4/26/2019 Topology
DESCRIPTION:
URL:https://cmsa.fas.harvard.edu/event/4-26-2019-topology/
LOCATION:MA
CATEGORIES:Colloquia & Seminar,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20190425T103000
DTEND;TZID=America/New_York:20190425T233000
DTSTAMP:20260523T062217
CREATED:20240212T102109Z
LAST-MODIFIED:20240212T102109Z
UID:10001974-1556188200-1556235000@cmsa.fas.harvard.edu
SUMMARY:4/25/2019 General Relativity Seminar
DESCRIPTION:
URL:https://cmsa.fas.harvard.edu/event/4-25-2019-general-relativity-seminar/
LOCATION:MA
CATEGORIES:Colloquia & Seminar,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20190425T000000
DTEND;TZID=America/New_York:20190425T130000
DTSTAMP:20260523T062217
CREATED:20240221T092017Z
LAST-MODIFIED:20240221T092017Z
UID:10002771-1556150400-1556197200@cmsa.fas.harvard.edu
SUMMARY:4/25/2019 Fluid Dynamics Seminar
DESCRIPTION:
URL:https://cmsa.fas.harvard.edu/event/4-25-2019-fluid-dynamics-seminar/
LOCATION:MA
CATEGORIES:Colloquia & Seminar,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20190424T163000
DTEND;TZID=America/New_York:20190424T173000
DTSTAMP:20260523T062217
CREATED:20240212T103852Z
LAST-MODIFIED:20240514T180043Z
UID:10001998-1556123400-1556127000@cmsa.fas.harvard.edu
SUMMARY:Credible Mechanisms
DESCRIPTION:Speaker: Shengwu Li (Harvard)\n\n\nTitle: Credible Mechanisms\n\nAbstract: Consider an extensive-form mechanism\, run by an auctioneer who communicates sequentially and privately with agents. Suppose the auctioneer can deviate from the rules provided that no single agent detects the deviation. A mechanism is credible if it is incentive-compatible for the auctioneer to follow the rules. We study the optimal auctions in which only winners pay\, under symmetric independent private values. The first-price auction is the unique credible static mechanism. The ascending auction is the unique credible strategy-proof mechanism.
URL:https://cmsa.fas.harvard.edu/event/4-24-2019-colloquium/
LOCATION:MA
CATEGORIES:Colloquium
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/CMSA-Colloquium-042419.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20190424T150000
DTEND;TZID=America/New_York:20190424T160000
DTSTAMP:20260523T062217
CREATED:20240212T103457Z
LAST-MODIFIED:20240212T103457Z
UID:10001992-1556118000-1556121600@cmsa.fas.harvard.edu
SUMMARY:4/24/2019 Fluid Dynamics Seminar
DESCRIPTION:
URL:https://cmsa.fas.harvard.edu/event/4-24-2019-fluid-dynamics-seminar/
LOCATION:MA
CATEGORIES:Colloquia & Seminar,Seminars
END:VEVENT
END:VCALENDAR