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Event Series General Relativity Seminar

Real-time observables in horizon thermodynamics

Virtual

https://youtu.be/zxjuAlzuW78 General Relativity Seminar Speaker: Albert Law, Stanford Title: Real-time observables in horizon thermodynamics Abstract: Euclidean black hole 1-loop determinants have recently been shown to compute a renormalized thermal canonical partition function for free fields in Lorentzian signature. A key ingredient is a 'quasinormal mode (QNM) character', whose Fourier transform equals the renormalized spectral density of the […]

Mathematical Aspects of Scattering Amplitudes Lecture

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

Mathematical Aspects of Scattering Amplitudes Lecture Speaker: Jacob Bourjaily, Penn State Title: The Algebraic and Transcendental Structure of Perturbative QFT

Event Series Algebraic Geometry in String Theory Seminar

Computing periods of hypersurfaces and elliptic surfaces via effective homology

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

Algebraic Geometry in String Theory Seminar Speaker: Eric Pichon-Pharabod, Universite Paris-Saclay Title: Computing periods of hypersurfaces and elliptic surfaces via effective homology Abstract: The period matrix of a smooth complex projective variety X encodes the isomorphism between its singular homology and its algebraic De Rham cohomology. Numerical approximations with sufficient precision of the entries of this […]

Event Series Quantum Matter in Mathematics and Physics Seminar

From quantum Hall to Hubbard physics in twisted bilayer graphene

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

Quantum Matter in Mathematics and Physics Seminar Speaker: Eslam Khalaf (Harvard) Title: From quantum Hall to Hubbard physics in twisted bilayer graphene Abstract: Early on it was noticed that twisted bilayer graphene (TBG) has elements in common with two paradigmatic examples of strongly correlated physics: Hubbard physics and quantum Hall physics. On the one hand, […]

Event Series Member Seminar

On the landscape of 4d N=2 SCFTs

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

CMSA Member Seminar Speaker: Robert Moscrop, Harvard CMSA Title: On the landscape of 4d N=2 SCFTs Abstract: Four-dimensional conformal field theories with sufficient (N = 2) supersymmetry are highly constrained. So much so, there has been an ongoing effort to classify them using only information about their moduli space of vacua. In this talk, I will review […]

Event Series General Relativity Seminar

An analogue of non-interacting quantum field theory in Riemannian signature

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

General Relativity Seminar Speaker: Mikhail Molodyk, Stanford Title: An analogue of non-interacting quantum field theory in Riemannian signature Abstract: Recent advances using microlocal tools have led to constructions, for wave operators on various classes of spacetimes, of four distinguished Fredholm inverses which have the singular behavior required of retarded, advanced, Feynman, and anti-Feynman propagators in QFT. Vasy […]

Event Series Quantum Matter in Mathematics and Physics Seminar

Improving Mean-Field Theory for Quantum Magnets

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

Quantum Matter in Mathematics and Physics Seminar Speaker: Junyi Zhang, Johns Hopkins University Title: Improving Mean-Field Theory for Quantum Magnets Abstract: Frustrated magnets have garnered significant attention because of their potential to host exotic spin liquids, while many real material candidates exhibit magnetic orders.  Due to their proximity to spin liquid phases, the semiclassical descriptions […]

Event Series Colloquium

Errors and Correction in Cumulative Knowledge

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

Colloquium Speaker: Madhu Sudan, Harvard University Title: Errors and Correction in Cumulative Knowledge Abstract: Societal accumulation of knowledge is a complex, and arguably error-prone, process. The correctness of new units of knowledge depends not only on the correctness of the new reasoning, but also on the correctness of old units that the new one builds […]

Event Series Member Seminar

Quasilocal mass for general domains in space

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

CMSA Member Seminar Speaker: Jue Liu Title: Quasilocal mass for general domains in space Abstract: Diffeomorphism-invariant quasilocal mass in classical general relativity has been studied for decades, but it is still an open problem how to define quasi-local mass for general domains with multiple boundaries in space. Using the Hamiltonian formulation, we will provide a new way […]

Mathematical Aspects of Scattering Amplitudes Lecture

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

Mathematical Aspects of Scattering Amplitudes Lecture Speaker: James Drummond, University of Southampton Title: Multiple light-like Wilson loops in N=4 super Yang-Mills theory

Mathematical Aspects of Scattering Amplitudes Lecture

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

Mathematical Aspects of Scattering Amplitudes Lecture Speaker: Matteo Parisi, Harvard CMSA Title: The amplituhedron and cluster algebras