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Calendar of Physics Talks Vienna
| TQFTs, HQFTs and other category theoretical approaches to quantum field theory (Vienna Theory Lunch Seminar) |
| Speaker: | Paul Grosskopf (Université libre de Bruxelles) |
| Abstract: |
Topological Quantum Field Theories (short: TQFTs) are mathematical toy models for quantum field theory. Coming from physics they quickly sparked interest with mathematicians, not only because they lead to new topological invariants for manifolds or knots. Going back to Atiyah the most common formulation uses category theory to describe d-dimensional TQFTs as functors from the d-bordism category to some symmetric monoidal category, most noteably the category of vector spaces and linear maps. Many variations of these have developed over the years, such as Homotopy Quantum Field Theories (HQFTs), open/closed TQFTs or defect TQFTs. [...]
[[part of the "Vienna Theory Lunch Seminar, see https://lunch-seminar.univie.ac.at ]] |
| Date: | Tue, 05.12.2023 |
| Time: | 12:30 |
| Duration: | 75 min |
| Location: | University of Vienna, Boltzmanngasse 5, 5th floor, Schrödinger Lecture Hall |
| Contact: | Florian Lindenbauer |
| AdS/Yang Mills: from QCD to Composite Higgs |
| Speaker: | Nicholas Evans (University of Southampton) |
| Abstract: | I discuss a programme to describe the chiral symmetry breaking dynamics and spectra of all asymptotically free non-supersymmetric gauge theories using holography. Our holographic description inputs the perturbative running of the gauge theory to motivate the non-perturbative running of the anomalous dimensions of operators. The dynamics and spectra are then predicted. In addition we use Witten's multi-trace prescription to include strongly coupled NJL four fermion interactions. Masses and mass splittings require a full non-abelian flavour structure and a bulk higgs mechanism. Examples of interesting theories are: QCD where the spectra can be systematically improved by higher dimension operators (in the spirit of "perfection" on the lattice) and predictions made for exotics such as the sexaquark mass; theories with multiple fermion representations where large mass gaps between [...] |
| Date: | Tue, 05.12.2023 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | Fakultaet fuer Physik, Erwin Schroedinger-HS, Boltzmanngasse 5, 5. Stock |
| Contact: | Adrien Fiorucci, Daniel Grumiller |
| Electroweak and Finite-Lifetime Corrections for Boosted Top Quark Production |
| Speaker: | Daniel Lechner (University of Vienna) |
| Abstract: | Jet mass measurements for processes involving boosted top quark pair-production at the HL-LHC or future lepton colliders are a very promising tool for high-precision measurements of the top quark mass in a well-defined renormalization scheme. Apart from including QCD corrections and resummations, for which well-developed frameworks exist, eventually also electroweak and finite-lifetime effects need to be accounted for systematically. For boosted top quark initiated inclusive jets we apply an electroweak Soft-Collinear-Effective-Theory (SCET) framework that allows for a coherent resummation of electroweak Sudakov and rapidity logarithms and finite-lifetime effects together with large logs from QCD. Apart from double-top-resonant effects, the factorization approach can also account for single-resonant effects, which are related to the interference of final states originating from top quark |
| Date: | Tue, 05.12.2023 |
| Time: | 16:15 |
| Duration: | 60 min |
| Location: | Fakultaet fuer Physik, Josef Stefan-HS, Boltzmanngasse 5, 3. Stock |
| Contact: | A. Hoang, M. Procura |
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