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  • Dynamics of active nematic defects on cones

    CMSA Room G10 CMSA, 20 Garden Street, Cambridge, MA, United States

    Member Seminar Speaker: Farzan Vafa Title: Dynamics of active nematic defects on cones Abstract: In the first part of the talk, we investigate the ground-state configurations of two-dimensional liquid crystals with p-fold rotational symmetry (p-atics) on cones. The cone apex develops an effective topological charge, which in analogy to electrostatics, leads to defect absorption and emission […]

  • CMSA Probability Seminar 02.15.23

    Manifold Fitting: An Invitation to Statistics

    CMSA Room G10 CMSA, 20 Garden Street, Cambridge, MA, United States

    Probability Seminar Speaker: Zhigang Yao (Harvard CMSA/National University of Singapore) Title: Manifold Fitting: An Invitation to Statistics Abstract: This manifold fitting problem can go back to H. Whitney’s work in the early 1930s (Whitney (1992)), and finally has been answered in recent years by C. Fefferman’s works (Fefferman, 2006, 2005). The solution to the Whitney extension problem […]

  • CMSA Active Matter Seminar 02.16.23

    Towards programmable living materials and quantitative models of active matter

    CMSA Room G10 CMSA, 20 Garden Street, Cambridge, MA, United States

    Active Matter Seminar Speaker: Jörn Dunkel, MIT Title: Towards programmable living materials and quantitative models of active matter Abstract: Over the last two decades, major progress has been made in understanding the self-organization principles of active matter.  A wide variety of experimental model systems, from self-driven colloids to active elastic materials, has been established, and an extensive […]

  • CMSA GR Seminar 02.16.23

    Quasinormal Modes from Penrose Limits

    CMSA Room G10 CMSA, 20 Garden Street, Cambridge, MA, United States

    https://youtu.be/taeAnXApzg4 General Relativity Seminar Speaker: Kwinten Fransen (UC Santa Barbara) Title: Quasinormal Modes from Penrose Limits Abstract: In this talk, I will explain how to describe quasinormal modes with large real frequencies using Penrose limits. To do so, I first recall relevant aspects of the Penrose limit, and its resulting plane wave spacetimes, as well as quasinormal […]

  • CMSA QMMP 02.17.23

    Quantum Spin Lakes: NISQ-Era Spin Liquids from Non-Equilibrium Dynamics

    Virtual

    Quantum Matter Seminar Speaker: Rahul Sahay (Harvard) Title: Quantum Spin Lakes: NISQ-Era Spin Liquids from Non-Equilibrium Dynamics Abstract: While many-body quantum systems can in principle host exotic quantum spin liquid (QSL) states, realizing them as ground states in experiments can be prohibitively difficult. In this talk, we show how non-equilibrium dynamics can provide a streamlined […]

  • Hints of Flat Space Holography

    CMSA Room G10 CMSA, 20 Garden Street, Cambridge, MA, United States

    Member Seminar Speaker: Dan Kapec Title: Hints of Flat Space Holography Abstract: Despite our detailed understanding of holography in Anti-de Sitter space, flat space holography remains somewhat mysterious. “Celestial CFT” is a formalism which attempts to recast quantum gravity in (d+2)-dimensional asymptotically flat spacetimes in terms of a d-dimensional Euclidean conformal field theory residing at the conformal […]

  • 02CMSA Colloquium 02.22.2023

    The Black Hole Information Paradox: A Resolution on the Horizon?

    CMSA Room G10 CMSA, 20 Garden Street, Cambridge, MA, United States

    Speaker: Netta Engelhardt (MIT) Title: The Black Hole Information Paradox: A Resolution on the Horizon? Abstract: The black hole information paradox — whether information escapes an evaporating black hole or not — remains one of the most longstanding mysteries of theoretical physics. The apparent conflict between validity of semiclassical gravity at low energies and unitarity […]

  • Thresholds for edge colorings

    Virtual

    Probability Seminar Speaker: Vishesh Jain (University of Illinois Chicago) Title: Thresholds for edge colorings Abstract: We show that if each edge of the complete bipartite graph K_{n,n} is given a random list of C(\log n) colors from , then with high probability, there is a proper edge coloring where the color of each edge comes […]

  • CMSA GR Seminar 02.23.23

    Formation of trapped surfaces in the Einstein-Yang-Mills system

    Virtual

    https://youtu.be/z7q0LGNVPII General Relativity Seminar Speaker: Nikolaos Athanasiou (University of Crete, Greece) Title: Formation of trapped surfaces in the Einstein-Yang-Mills system Abstract: The purpose of this talk is to give an overview of a semi-global existence result and a trapped surface formation results in the context of the Einstein-Yang-Mills system. Adopting a “signature for decay rates” […]

  • CMSA Algebraic Geometry in String Theory 02.24.2023

    On the convexity of general inverse $\sigma_k$ equations and some applications

    CMSA Room G10 CMSA, 20 Garden Street, Cambridge, MA, United States

    Algebraic Geometry in String Theory Seminar Speaker: Chao-Ming Lin (University of California, Irvine) Title: On the convexity of general inverse $\sigma_k$ equations and some applications Abstract: In this talk, I will show my recent work on general inverse $\sigma_k$ equations and the deformed Hermitian-Yang-Mills equation (hereinafter the dHYM equation). First, I will show my recent […]

  • Poster_GeometryStatistics_8.5x11.final

    Conference on Geometry and Statistics

    CMSA Room G10 CMSA, 20 Garden Street, Cambridge, MA, United States

    On Feb 27-March 1, 2023 the CMSA will host a Conference on Geometry and Statistics. Location: G10, CMSA, 20 Garden Street, Cambridge MA 02138 Organizing Committee: Stephan Huckemann (Georg-August-Universität Göttingen) Ezra Miller (Duke University) Zhigang Yao (Harvard CMSA and Committee Chair) Scientific Advisors: Horng-Tzer Yau (Harvard CMSA) Shing-Tung Yau (Harvard CMSA) Speakers: Tamara Broderick (MIT) […]

  • New bounds on lattice covering volumes, and nearly uniform covers

    CMSA Room G10 CMSA, 20 Garden Street, Cambridge, MA, United States

    Member Seminar Speaker: Barak Weiss   Title: New bounds on lattice covering volumes, and nearly uniform covers Abstract: Let L be a lattice in R^n and let K be a convex body. The covering volume of L with respect to K is the minimal volume of a dilate rK, such that L+rK = R^n, normalized by the […]