Albert Einstein Center for Fundamental Physics |
Institute for Theoretical Physics |
Gravity and String Theory Group
| Fields, Strings and Dualities Group]
- Mini-Conference Series of the Swiss String Theory Community
Meeting of the Members of the SwissMAP
String Theory Project
- (originally the Geneva
- Neuchâtel - Zürich informal String Seminars)
- Friday May 13 2022
- New Postdocs / Recent Arrivals Day
- ExWi (Exact Science Building), University of Bern
- Fabio Apruzzi (UniBe): A modern view on symmetries and symmetry theories
Abstract: Symmetries are defined in terms of
topological operators acting on local and extended objects of a quantum field theory (QFT). This leads to various generalizations of the concept of symmetry. I will first review these generalizations. I will then present and describe a useful gadget called (higher form) symmetry topological field theory (TFT) that encodes the symmetry data and 't Hooft anomalies of d-dimensional QFT in a (d+1)-dimensional topological action. I will show two possible derivations of the symmetry TFTs in explicit examples. The first derivation relies on the "near-horizon" like limits of the string theory configurations that engineer the studied QFTs. The second consists of a "weak coupling" method that relies on effective Lagrangian descriptions.
- Tommaso Macrelli (ETHZ): Homotopy algebras, gauge theories, and gravity
Abstract: After a review of Batalin-Vilkovisky formalism and homotopy algebras, we discuss how these structures emerge in quantum field theory and gravity. We focus then on the application of these sophisticated mathematical tools to colour-kinematics duality and double copy, introducing an adequate notion of colour-kinematics factorisation.
- Marco Meineri (UniGe): Radiation and islands at the end of the world (and beyond)
Abstract: Conformal field theories with boundaries and interfaces are a useful playground to study time dependent observables, like the energy and entanglement carried by radiation. In holographic CFTs, the interface itself might be replaced by its dual brane, thus realizing a system where a gravitational region is coupled to a non-gravitating bath. I will focus in particular on the entanglement entropy in two dimensional CFT, and on its interpretation in the gravity+bath picture. Along the way, I will comment on the holographic dictionary for boundary operators.
- Irene Valenzuela (CERN): Swampland and Black holes
- Zhao Xiang (EPFL): Flat-space limit of QFT in AdS
Abstract: In this talk I will explain a procedure on extracting (d+1)-dimensional flat-space S-matrix from d-dimensional conformal correlation functions. The main idea is to put QFT in anti-de Sitter (AdS) space and then take the flat-space limit. I will also examine this procedure through a few examples. Interestingly, the procedure does not always work, but the failure, when present, also knows about the flat-space information.
- 10.45 -- 11.15: Welcome Coffee
- 11.15 -- 11.45: Fabio Apruzzi
- 11.45 -- 12.15: Tommaso Macrelli
- 12.15 -- 13.45: Lunch Break
- 13.45 -- 14.15: Marco Meineri
- 14.15 -- 14.45: Irene Valenzuela
- 14.45 -- 15.15: Coffee Break
- 15.15 -- 15.45: Zhao Xiang
- Further Information:
- For the coffee break catering it is important to have a reasonably precise idea a few days in advance
how many participants we can expect. Therefore, if you are planning to attend,
please let us know (by May 10) via the following
(this is not compulsory but will help us - thank you!)
- Venue: The meeting will take place in the
ExWi (Exact Sciences) Building of the University.
- Lectures: Lecture Hall 099 on the Ground Floor of the ExWi
- Coffee/Tea Welcome: Ground Floor Entrance Hall of the ExWi
- How to get (t)here:
- The ExWi Building is (like the main building of the University) basically
just on top of the
Bern train station. The quickest way to get there from the train station is to
take the elevator going up directly from the train station to the University area
(at the platform 13 end of the underground corridor - just follow the signs to the University).
- Once you are at the top (Grosse Schanze / Einstein-Terrasse), turn around and you will face the
Main Building of the University. The ExWi building is the more modern (60s) building to the
right of the Main Building (the one with all the antennas and satellite dishes on the roof).
Schematic Map of the ExWi / Train Station / University Area (Lift zum
Bahnhof = elevator to train station)
- Matthias Blau
- Susanne Reffert