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CMSA Room G10

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CMSA GR Seminar 03.09.23

Pseudospectrum and black hole quasinormal mode instability: An ultraviolet universality conjecture

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

https://youtu.be/teqIIXRJXd4 General Relativity Seminar Speaker: Jose Luis Jaramillo (Bourgogne U.) Title: Pseudospectrum and black hole quasinormal mode instability: an ultraviolet universality conjecture Abstract: Can we measure the ‘effective regularity’ of spacetime from the perturbation of quasi-normal mode (QNM) overtones? Black hole (BH) QNMs encode the resonant response of black holes under linear perturbations, their associated […]

How to steer foundation models?

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

https://youtu.be/ztk5TPYTKZA New Technologies in Mathematics Seminar Speaker: Jimmy Ba, University of Toronto Title: How to steer foundation models? Abstract: By conditioning on natural language instructions, foundation models and large language models (LLMs) have displayed impressive capabilities as general-purpose computers. However, task performance depends significantly on the quality of the prompt used to steer the model. […]

02CMSA Colloquium 03.08.2023

Conformal symmetry, Optimization algorithms and the Critical Phenomena

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

Speaker: Ning Su, University of Pisa Title: Conformal symmetry, Optimization algorithms and the Critical Phenomena Abstract: In the phase diagram of many substances, the critical points have emergent conformal symmetry and are described by conformal field theories. Traditionally, physical quantities near the critical point can be computed by perturbative field theory method, where conformal symmetry […]

Categorical Symmetry of the Standard Model from Gravitational Anomaly 

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

Member Seminar Speaker: Juven Wang Title: Categorical Symmetry of the Standard Model from Gravitational Anomaly Abstract: In the Standard Model, the total "sterile right-handed" neutrino number n_{νR} is not equal to the family number Nf. The anomaly index (-Nf+n_{νR}) had been advocated to play an important role in our previous work on Cobordism and Deformation Class of […]

02CMSA Colloquium 03.02.2023

The string/black hole transition in anti de Sitter space

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

Speaker: Erez Urbach, Weizmann Institute of Science Title: The string/black hole transition in anti de Sitter space Abstract: String stars, or Horowitz-Polchinski solutions, are string theory saddles with normalizable condensates of thermal-winding strings. In the past, string stars were offered as a possible description of stringy (Euclidean) black holes in asymptotically flat spacetime, close to the […]

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 […]

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) […]

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 […]

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 […]

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 […]

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 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 […]