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  • CMSA-Active-Matter-Seminar-04.28.22

    Building active nematic and active polar liquids out of biological machines

    Virtual

    Speaker: Guillaume Duclos (Brandeis) Title: Building active nematic and active polar liquids out of biological machines Abstract: Active matter describes out-of-equilibrium materials composed of motile building blocks that convert free energy into mechanical work. The continuous input of energy at the particle scale liberates these systems from the constraints of thermodynamic equilibrium, leading to emergent collective behaviors not found in passive materials. In this talk, I […]

  • CMSA-Interdisciplinary-Science-Seminar-04.28.22-1583x2048-1

    Intersection number and systole on hyperbolic surfaces

    Abstract: Let X be a compact hyperbolic surface. We can see that there is a constant C(X) such that the intersection number of the closed geodesics is  \leq C(X) times the product of their lengths. Consider the optimum constant C(X). In this talk, we describe its asymptotic behavior in terms of systole,  length of the shortest […]

  • A new proof for the nonlinear stability of slowly-rotating Kerr-de Sitter

    Abstract: The nonlinear stability of the slowly-rotating Kerr-de Sitter family was first proven by Hintz and Vasy in 2016 using microlocal techniques. In my talk, I will present a novel proof of the nonlinear stability of slowly-rotating Kerr-de Sitter spacetimes that avoids frequency-space techniques outside of a neighborhood of the trapped set. The proof uses […]

  • Machine Learning the Gravity Equation for International Trade

    Virtual

    Member Seminar Speaker: Sergiy Verstyuk Title: Machine Learning the Gravity Equation for International Trade Abstract: We will go through modern deep learning methods and existing approaches to their interpretation. Next, I will describe a graph neural network framework. You will also be introduced to an economic analog of gravity. Finally, we will see how these […]

  • GR Workshop Poster

    General Relativity Workshop

    CMSA 20 Garden Street, Cambridge, MA, United States

    General Relativity Workshop on scalar curvature, minimal surfaces, and initial data sets Dates: May 2–5, 2022 Location: Room G10, CMSA, 20 Garden Street, Cambridge MA 02138 and via Zoom webinar. Advanced registration for in-person components is required. Organizers: Dan Lee (CMSA/CUNY), Martin Lesourd (CMSA/BHI), and Lan-Hsuan Huang (University of Connecticut). Speakers: Zhongshan An, University of Connecticut […]

  • CMSA-Combinatorics-Physics-and-Probability-Seminar-05.03.22

    The threshold for stacked triangulations

    Hybrid

    Abstract: Consider a bootstrap percolation process that starts with a set of `infected’ triangles $Y \subseteq \binom{}3$, and a new triangle f gets infected if there is a copy of K_4^3 (= the boundary of a tetrahedron) in which f is the only not-yet infected triangle. Suppose that every triangle is initially infected independently with […]

  • 2022 NSF FRG Workshop on Discrete Shapes

    CMSA 20 Garden Street, Cambridge, MA, United States

    On May 6–8, 2022, the CMSA  hosted a second NSF FRG Workshop. This project brings together a community of researchers who develop theoretical and computational models to characterize shapes. Their combined interests span Mathematics (Geometry and Topology), Computer Science (Scientific Computing and Complexity Theory), and domain sciences, from Data Sciences to Computational Biology. Scientific research […]

  • Kuranishi_Harvard_10x12-2

    Conference in Memory of Professor Masatake Kuranishi

    Science and Engineering Complex (SEC) 150 Western Ave, Allston, MA 02134, MA

    On May 9–12, 2022, the CMSA hosted the conference Deformations of structures and moduli in geometry and analysis: A Memorial in honor of Professor Masatake Kuranishi. Organizers:  Tristan Collins (MIT) and Shing-Tung Yau (Harvard and Tsinghua) Videos are available on the conference playlist.   Speakers: Charles Fefferman (Princeton University) Teng Fei (Rutgers University) Robert Friedman (Columbia […]

  • Inflation and light Dark Matter constraints from the Swampland

    Virtual

    Abstract: I will explore the interplay between Swampland conjectures and models of inflation and light Dark Matter. To that end, I will briefly review the weak gravity conjecture (WGC) and the related Festina Lente (FL) bound. These have implications for light darkly and milli-charged particles and can disfavor a large portion of parameter space. The FL bound […]

  • CMSA-QMMP-Seminar-05.11.22-1583x2048

    Cosmology from the vacuum

    https://www.youtube.com/watch?v=QMbWPWeuJOQ&list=PL0NRmB0fnLJQAnYwkpt9PN2PBKx4rvdup&index=12 Abstract: We are familiar with the idea that quantum gravity in AdS can holographically emerge from complex patterns of entanglement, but can the physics of big bang cosmology emerge from a quantum many-body system? In this talk I will argue that standard tools of holography can be used to describe fully non-perturbative microscopic models of cosmology in which a period […]

  • CMSA-QMMP-Seminar-05.12.22-1583x2048-1

    Oblique Lessons from the W Mass Measurement at CDF II

    https://www.youtube.com/watch?v=jnWI9sCfAi0&list=PL0NRmB0fnLJQAnYwkpt9PN2PBKx4rvdup&index=11&t=2s Abstract: The CDF collaboration recently reported a new precise measurement of the W boson mass MW with a central value significantly larger than the SM prediction. We explore the effects of including this new measurement on a fit of the Standard Model (SM) to electroweak precision data. We characterize the tension of this new measurement […]