As part of the program on Spacetime and Quantum Mechanics, the CMSA will be hosting a weekly seminar on Thursdays at 2:30pm in room G10.
Date  Speaker  Title/Abstract 

9/12/2019 
Pasha Pylyavskyy (University of Minnesota) 

19/18/2019 2:00pm G02 
Francis Brown (University of Oxford) 
Title: Amplitudes, Polylogs and Moduli Spaces

9/19/2019 
Chuck Doran (University of Alberta) 
Title: CalabiYau geometry of the Nloop sunset Feynman integrals Abstract: I will present an overview of the algebraic and transcendental features of the computation of Nloop sunset Feynman integrals. Starting from the realization of arbitrary Feynman graph hypersurfaces as (generalized) determinantal varieties, we describe the CalabiYau subvarieties of permutohedral varieties that arise from the Nloop sunset Feynman graphs and some key features of their geometry and moduli. These include: (1) an iterated fibration structure which allows one to “bootstrap” both periods and PicardFuchs equations from lower N cases; (2) specialization to and interpretation of coincident mass loci (“jump loci”) in moduli; (3) a significant generalization of the GriffithsDwork algorithm via “creative telescoping”; and (4) the realization of CalabiYau pencils as LandauGinzburg models mirror to weak Fano varieties. Details of each of these will be discussed in later lectures this semester. This is joint work with Pierre Vanhove and Andrey Novoseltsev. 
9/26/2019 
Tomasz Taylor (Northeastern) 
Title: Celestial Amplitudes 
10/3/2019 
Simon CaronHuot (McGill) 

10/10/2019 3:30pm 
Yutin Huang (National Taiwan University) 
Title: Dualities of Planar Ising Networks and the Positive Orthogonal Grassmannian 
10/15/2019 Tuesday 3:30pm 
Sergey Fomin (Univ. of Michigan)

Title: “Morsifications and mutations” (joint work with P. Pylyavskyy, E. Shustin, and D. Thurston). 
10/18/2019 Friday G02 
Sebastian Franco (The City College of New York) 
Title: Graded quivers, generalized dimer models, and topic geometry 
10/24/2019  
11/1/2019 SC 232 1:30pm 
George Lusztig (MIT) 
Title: Total positivity in Springer fibres. 
11/7/2019 


11/14/2019 G02 


11/21/2019 


11/28/2019 


12/5/2019 


12/12/2019 

