Program

13:30 Tea & Coffee.
14:00 Victor Gorbenko (EPFL) - Peculiarities of RG flows in O(n) models
15:15 Coffee break.
15:45 Thomas Grimm (UU) - The Tameness of Quantum Field Theories
17:00 Borrel (drinks and snacks), at Polder 

Abstracts

Victor Gorbenko (EPFL)
Peculiarities of RG flows in O(n) models

Abstract: I will discuss the two-dimensional O(n) model for a continuous range of n. It can be defined non-perturbatively for any n as an infrared limit of lattice loop models, which in the IR give rise to two families of CFTs. For n<2 these CFTs are logarithmic, while for n>2 they are also complex. The RG flow towards the fixed points violates the straightforward notion of naturalness and appears tuned. This may be a hint that certain non-standard symmetries play an important role in constraining these (and other) RG flows.

Thomas Grimm (UU)
The Tameness of Quantum Field Theories

Abstract: Tame geometry originated in mathematical logic and implements strong finiteness properties by defining the notion of tame sets and functions. In this talk I will give a brief introduction to the mathematical foundations of o-minimal structures and explain how one can make the connection between quantum field theories and logical structures precise. I then summarize the evidence that the tameness of a theory relies on its UV definition. I will motivate that it can serve as a novel principle for a theory to be compatible with quantum gravity. Applied to conformal field theories, I will quantify our expectations on the tameness of the set of such theories and its observables. I will end with some comments on how tameness allows one to implement a notion of finiteness of complexity.  

Location

Room C0.05, Science Park 904, Amsterdam

About

This event is part of a regular series of meetings sponsored by Delta ITP with the objective of bringing together the theoretical physics communities in Amsterdam, Leiden, Utrecht and our sister nodes Groningen, Brussels (ULB and VUB) and Leuven. The topic of this meeting is holography and its applications to different physical systems. We encourage researchers from different areas in theoretical physics to participate!

Organisers

Diego Hofman Uv Amsterdam
Umut Gursoy Utrecht Un.
Koenraad Schalm Leiden Un.