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DTSTART;TZID=America/New_York:20230302T160000
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DTSTAMP:20240216T085143Z
CREATED:20230817T180503Z
LAST-MODIFIED:20240216T085143Z
UID:10001276-1677772800-1677776400@cmsa.fas.harvard.edu
SUMMARY:The string/black hole transition in anti de Sitter space
DESCRIPTION:Speaker: Erez Urbach\, Weizmann Institute of Science \nTitle: The string/black hole transition in anti de Sitter space \nAbstract: 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 Hagedorn temperature. I will discuss the thermodynamic properties of string stars in asymptotically (thermal) anti-de Sitter background (including AdS3 with NS-NS flux)\, their possible connection to small black holes in AdS\, and their implications for holography. I will also present new “winding-string gas” saddles for confining holographic backgrounds such as the Witten model\, and their relation to the deconfined phase of 3+1 pure Yang-Mills.
URL:https://cmsa.fas.harvard.edu/event/collquium-3223/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Colloquium
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/02CMSA-Colloquium-03.02.2023.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20230308T123000
DTEND;TZID=America/New_York:20230308T133000
DTSTAMP:20240228T111406Z
CREATED:20230817T180824Z
LAST-MODIFIED:20240228T111406Z
UID:10001277-1678278600-1678282200@cmsa.fas.harvard.edu
SUMMARY:Conformal symmetry\, Optimization algorithms and the Critical Phenomena
DESCRIPTION:Speaker: Ning Su\, University of Pisa \nTitle: Conformal symmetry\, Optimization algorithms and the Critical Phenomena \nAbstract: 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 is not fully utilized. In this talk\, I will explain how conformal symmetry can be used to determine certain physical quantities\, without even knowing the fine details of the microscopic structure. To compute the observables precisely\, one needs to develop powerful numerical techniques. In the last few years\, we have invented many computational tools and algorithms\, and predicted critical exponents of Helium-4 superfluid phase transition and Heisenberg magnet to very high precision.
URL:https://cmsa.fas.harvard.edu/event/collquium-3823/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Colloquium
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/02CMSA-Colloquium-03.08.2023.png
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BEGIN:VEVENT
DTSTART;TZID=America/New_York:20230322T123000
DTEND;TZID=America/New_York:20230322T133000
DTSTAMP:20240216T104444Z
CREATED:20230817T181152Z
LAST-MODIFIED:20240216T104444Z
UID:10001278-1679488200-1679491800@cmsa.fas.harvard.edu
SUMMARY:Synchronization in a Kuramoto Mean Field Game
DESCRIPTION:Speaker: Mete Soner (Princeton University) \nTitle: Synchronization in a Kuramoto Mean Field Game \nAbstract:  Originally motivated by systems of chemical and biological oscillators\, the classical Kuramoto model has found an amazing range of applications from neuroscience to Josephson junctions in superconductors\, and has become a  key mathematical model to describe self organization in complex systems. These autonomous oscillators are coupled through a nonlinear interaction term which plays a central role in the long term behavior of the system. While the system is not synchronized when this term is not sufficiently strong\, fascinatingly\, they exhibit an abrupt transition to a full synchronization above a critical value of the interaction parameter.  We explore this system in the mean field formalism.  We treat the system of oscillators as an infinite particle system\, but instead of positing the dynamics of the particles\, we let the individual particles determine endogenously their behaviors by minimizing a cost functional and eventually\, settling in a Nash equilibrium.  The mean field game also exhibits a bifurcation from incoherence to self-organization.  This approach has found interesting applications including circadian rhythms and jet-lag recovery.  This is joint work with Rene Carmona of Princeton and Quentin Cormier of INRIA\, Paris.
URL:https://cmsa.fas.harvard.edu/event/collquium-32223/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Colloquium
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/CMSA-Colloquium-03.22.2023.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20230329T123000
DTEND;TZID=America/New_York:20230329T133000
DTSTAMP:20240216T102824Z
CREATED:20230817T181436Z
LAST-MODIFIED:20240216T102824Z
UID:10001279-1680093000-1680096600@cmsa.fas.harvard.edu
SUMMARY:Scattering amplitudes in quantum field theory
DESCRIPTION:Speaker: Ruth Britto (Trinity College Dublin) \nTitle: Scattering amplitudes in quantum field theory \nAbstract: Particle collider experiments require a detailed description of scattering events\, traditionally computed through sums of Feynman diagrams. However\, it is not practical to evaluate Feynman diagrams directly for all significant scattering processes. Moreover\, adding all diagrams reveals many cancellations: scattering amplitudes in theories such as QCD take remarkably simple forms. This simplicity is a clue that the perturbative theory is perhaps best understood without reference to Feynman diagrams. In fact\, it has recently become possible to explain some of this simplicity. I will show how to derive many amplitudes efficiently and elegantly\, and propose taming the remaining complexity with ideas drawn from combinatorics and geometry.
URL:https://cmsa.fas.harvard.edu/event/collquium-32923/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Colloquium
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/CMSA-Colloquium-03.29.2023.png
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