Mathematical Physics and String Theory

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Joint Seminar

This a joint online video seminar series on theoretical and mathematical physics organized together by the ASC and the universities of Heidelberg, Mainz and Vienna via a BigBlueButton interface.

It will take place on Mondays at 15:15.

If you are interested to participate, please send an email toIlka Brunner.

Next talk:
25.10. Michele Schiavina (ETH Zurich)
Title: BV-BFV approach to General Relativity
The BV-BFV formalism is a combination of the BV approach to quantisation of Lagrangian field theories with local symmetries and the BFV approach to quantisation of constrained Hamiltonian systems. It aims to assign compatible bulk-boundary cohomological data to a Lagrangian field theory on a manifold with boundary (and higher codimension strata), in view of a perturbative quantisation scheme that is compatible with cutting and gluing.

General Relativity (GR), seen as a field theory, is a very important example to phrase within this setting, and one in which interesting new insight and complications emerge already at the classical level.

In this talk I will present a summary of investigations on GR within the BV-BFV formalism, as well as other diffeomorphism-invariant theories, which have given access to rich and nontrivial information about the boundary structure of gravitational models. However, I will argue that the featured examples present unexpected complications for the program of quantisation with boundary (and higher strata).

Indeed, I will show how the BV-BFV construction provides a filter to refine the notion of classical equivalence of field theories, which distinguishes theories in terms of their bulk-boundary behaviour, suggesting that some realisations — among the class of classically equivalent ones—may be more suitable for quantisation with boundary. This allows us to differentiate between, e.g., metric and coframe gravity as well as different string theory models and their 1d analogues.

This is a summary of joint works with G. Canepa and A.S. Cattaneo.

25.10. Michele Schiavina (ETH Zurich)
08.11. Yongbin Ruan (Michigan U.)
15.11. Pavel Putrov (ICTP Trieste)
29.11. Kevin Costello (Perimeter)
06.12. Mykola Dedushenko (Stony Brook)
Past seminars summer 2021
05.07. Jan Manschot (Dublin) "Topological correlators of N=2* Yang-Mills theory"
21.06. Johanna Knapp (Melbourne) "Genus 1 fibered Calabi-Yau 3-folds with 5-sections - A GLSM perspective"
14.06. John Huerta (University of Lisbon) "Bundle gerbes on Lie supergroups"
17.05. Cyrill Closset (Birmingham) "Rank-1 5d SCFTs: Mapping out the U-plane"
10.05. Lukas Woike (Copenhagen) "Higher structures from modular categories"
03.05. Miguel Montero (Harvard) "Cobordisms, anomalies, and the Swampland"
26.04. Mathew Bullimore(Durham U.)"Towards a Mathematical Definition of the 3d Superconformal Index"
19.04. Francesco Benini (SISSA) "Superconformal Index and Gravitational Path Integral"
12.04. Shota Komatsu (CERN) "Three tales of de Sitter"
Past seminars winter 2020/2021
01.02. Andrea Brini "Quantum geometry and physics of Looijenga pairs"
25.01. Simeon Hellerman "The Large Quantum Number Expansion: Some Recent Developments"
11.01. Kasia Rejzner "BV-BFV formalism in perturbative AQFT"
14.12. Dmitri Bykov "Sigma models as Gross-Neveu models"
07.12. Susanne Reffert (U. Bern) "The large charge expansion"
16.11. Owen Gwilliam (U. of Massachusetts) "Centers of higher enveloping algebras and bulk-boundary systems"
09.11. Ilka Brunner (LMU) "Flow Defects and Phases of gauged linear sigma models"
02.11. Mathias Traube (MPI Munich) "Cardy Algebras, Sewing-Constraints and String-Nets"
26.10. Theo Johnson-Freyd (Perimeter) "3+1d topological orders with (only) an emergent fermion"
19.10. Chris Beem (Oxford U.) "Hall-Littlewood Chiral Rings and Derived Higgs Branches"
12.10. Ezra Getzler (Northwestern U.) "Gluing local gauge conditions in BV quantum field theory
Past seminars summer 2020

20.07. Thorsten Schimannek (Vienna U.) "The quantum geometry of genus one fibered Calabi-Yau threefolds"
13.07. Thomas Creutzig (Alberta) "Algebraic blow-up"
29.06. Alberto Cattaneo (Zurich) "Hamilton-Jacobi and Quantum Chern-Simons on Cylinders"
22.06 Simone Noja (Como) "On Some Global and Local Problems in Supergeometry"
15.06. Tomas Prochazka (LMU) "Grassmannian VOAs"
08.06. Ingmar Saberi (Heidelberg) "Holomorphic field theories and higher symmetries"
25.05. Christoph Chiaffrino (LMU) “Planar Quantum A-Infinity Algebras”
18.05. Nils Carqueville (Vienna) “An introduction to functorial TQFT with defects”
11.05. Ivo Sachs (LMU) "From BV to string theory and back"