Spacetime and Quantum Mechanics Seminar

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)

Title: Vector-relation configurations and plabic graphs

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: Calabi-Yau geometry of the N-loop sunset Feynman integrals

Abstract: I will present an overview of the algebraic and transcendental features of the computation of N-loop sunset Feynman integrals.

Starting from the realization of arbitrary Feynman graph hypersurfaces as (generalized) determinantal varieties, we describe the Calabi-Yau subvarieties of permutohedral varieties that arise from the N-loop 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 Picard-Fuchs equations from lower N cases; (2) specialization to and interpretation of coincident mass loci (“jump loci”) in moduli; (3) a significant generalization of the Griffiths-Dwork algorithm via “creative telescoping”; and (4) the realization of Calabi-Yau pencils as Landau-Ginzburg 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 Caron-Huot (McGill)

Title: Poincare Duals of Feynman Integrals

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

 

 

 

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