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CMSA Colloquium 04.03.2023

Black hole microstate counting from the gravitational path integral

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

Colloquium Speaker: Luca Iliesiu, Stanford Title: Black hole microstate counting from the gravitational path integral Abstract: Reproducing the integer count of black hole micro-states from the gravitational path integral is an important problem in quantum gravity. In the first part of the talk, I will show that, by using supersymmetric localization, the gravitational path integral for 1/16-BPS black […]

The Role of Orientational Order in Development

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

Active Matter Seminar Speaker: Mark Bowick, Kavli Institute for Theoretical Physics, UCSB Title: The Role of Orientational Order in Development Abstract: Morphogenesis, the process through which genes generate form, establishes tissue scale order as a template for constructing the complex shapes of the body plan. The extensive growth required to build these ordered substrates is fueled […]

CMSA GR Seminar 03.30.23

Gravitational perturbations near to extreme Kerr

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

https://youtu.be/VdfmeuDoofY General Relativity Seminar Speaker: Alejandra Castro (University of Cambridge) Title: Gravitational perturbations near to extreme Kerr Abstract: Gravitational perturbations of a black hole illustrate the invaluable synergy between theory, experiment, and numerical simulations in general relativity. A recent development in the theory side has been the identification of the relevant degrees of freedom describing the low energy […]

CMSA Colloquium 03.29.2023

Scattering amplitudes in quantum field theory

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

Speaker: Ruth Britto (Trinity College Dublin) Title: Scattering amplitudes in quantum field theory Abstract: 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 […]

Monotonicity of quasilocal mass for asymptotically flat Riemannian manifolds

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

Member Seminar Speaker: Jue Liu Title: Monotonicity of quasilocal mass for asymptotically flat Riemannian manifolds Abstract: The study of quasilocal mass in general relativity has a long history. In previous papers by many authors we have a deep understanding of the properties of quasilocal mass such as positivity, rigidity and asymptotics etc. In this talk I will focus […]

CMSA Swampland Seminar 03.27.23

Recent developments on the tidal Love numbers of black holes

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

Swampland Seminar Speaker: Valerio De Luca (UPenn) Title: Recent developments on the tidal Love numbers of black holes Abstract: Tidal Love numbers describe the deformability of compact objects under the presence of external tidal perturbations, and are found to be exactly zero for black holes in pure General Relativity. This property is however fragile, since […]

CMSA GR Seminar 03.23.23

New Phases of N=4 SYM

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

https://youtu.be/Kt7n_0t6sgo General Relativity Seminar Speaker: Prahar Mitra (University of Cambridge) Title: New Phases of N=4 SYM Abstract: We construct new static solutions to gauged supergravity that, via the AdS/CFT correspondence, are dual to thermal phases in N=4 SYM at finite chemical potential. These solutions dominate the micro-canonical ensemble and are required to ultimately reproduce the microscopic entropy of AdS […]

CMSA Colloquium 03.22.2023

Synchronization in a Kuramoto Mean Field Game

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

Speaker: Mete Soner (Princeton University) Title: Synchronization in a Kuramoto Mean Field Game Abstract:  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 […]

Quantum Gravity constraints beyond asymptotic regimes

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

Member Seminar Speaker: Max Wiesner Title: Quantum Gravity constraints beyond asymptotic regimes Abstract: Not every effective field theory that is consistent in the absence of gravity can be completed to a consistent theory of quantum gravity. The goal of the Swampland program is to find general criteria that distinguish effective field theories, that can be obtained […]

Tensorial TQFT and disentangling modular Walker-Wang models

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

Quantum Matter Seminar Speaker: Andreas Bauer  (Freie Universität Berlin) Title: Tensorial TQFT and disentangling modular Walker-Wang models Abstract: I will introduce simple "tensorial" definitions for many algebraic and categorical structures appearing in the classification of topological phases of matter. Such "tensorial TQFTs" will be defined as maps that associate tensors to geometric/topological objects of some […]

Randomized algorithms in combinatorics

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

Member Seminar Speaker: Michael Simkin Title: Randomized algorithms in combinatorics Abstract: Randomized algorithms have been a computational workhorse for almost as long as there have been computers. Surprisingly, such algorithms can also be used to attack problems that are neither algorithmic nor probabilistic. Time permitting I will discuss the following combintorial examples: Enumerative combinatorics and the […]

String theory scalar potentials and their critical points

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

Swampland Seminar Speaker: David Andriot (Annecy, LAPTH) Title: String theory scalar potentials and their critical points Abstract: Positive scalar potentials in string effective theories could provide an origin to Dark Energy, responsible for the accelerated expansion of our universe today or during inflation. It is thus crucial to characterize these scalar potentials, namely their slope, […]