Past Events

[Zoom Seminar] Tensor Field Theories: Renormalization and Random Geometry (Dr. Nicolas Delporte, Toriumi Unit)

2020-11-30
Zoom or L4F01 (Lab 4, Floor F)

Title: Tensor Field Theories: Renormalization and Random Geometry

Abstract: In the talk, I will share an overview of my research during my PhD thesis. After a practically-minded introduction to renormalization and conformal field theories (CFT), we will see the essential tools developed for tensor models and their large-$N$ expansion. In the second part, I will focus on results of $d>1$ tensor field theories: melonic CFTs, breaking of symmetries. In the last part, we will revive an old approach to study and renormalize an interacting scalar quantum field theory on Galton-Watson random trees, through random walks, which may prove useful for tensor models to escape the melonic large-$N$ limit.

Zoom:

https://oist.zoom.us/j/94081328725?pwd=aFBTdkUvZTdXVU1BYTd6bTUvZHJKdz09

Meeting ID: 940 8132 8725
Passcode: 609087

Colored Tensor Models Review by Yi-Shan

2020-11-26
Discussion Room Level F

Presentation

Colored Tensor Models Review by Yi-Shan

2020-11-16
L4F01

Weekly presentaion

Colored Tensor Models Review by Yi-Shan

2020-11-09
L4F01

Weekly presentaion

Colored Tensor Models Review by Yi-Shan

2020-11-06

Weekly presentaion

Colored Tensor Models Review by Yi-Shan

2020-10-29
L4E48

Weekly presentaion

Colored Tensor Models Review by Yi-Shan

2020-10-19
L4F01

Weekly presentaion

Colored Tensor Models Review by Yi-Shan

2020-10-12
L4F01

Weekly presentation

Colored Tensor Models Review by Yi-Shan

2020-10-05
L4F01

Weekly presentation

Presidential Lecture - "The Square Peg Problem" by Dr. Andrew Lobb

2020-07-30
Lab 4 Level E48

The phrase "A square peg in a round hole" means something or someone conforming to unsuitable surroundings.  It's an unsolved conjecture over a century old that given any shape of hole - in other words any closed curve in the plane - you can always find four points on the curve that form the vertices of a square.  This says that square pegs can be made to fit into any shape hole, not just into square ones! I'll talk about this conjecture, its history, recent progress, and surprising and beautiful connections with famously one-sided surfaces such as the Moebius strip and the Klein bottle.

Andrew Lobb was an undergraduate at Oxford University and then took up a Kennedy Scholarship at Harvard University for his PhD studies.  During these studies, he became interested in low-dimensional topology and wrote his thesis on applications of quantum knot invariants to 4-dimensional problems. Dr. Lobb moved back to the UK for a postdoctoral position at Imperial College London, then returned to the USA for second postdoc at Stony Brook which included six months leave to take part in a program at MSRI.  He has been at Durham University in the UK since 2011.

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