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Calendar of Physics Talks Vienna
| Internal Levin-Wen models |
| Speaker: | Vincentas Mulevicius (ESI Vienna) |
| Abstract: | In this talk we will discuss (2+1)-dimensional topological phases of matter. In particular we will recall how they arise as degenerate ground states of lattice systems having a gapped Hamiltonian.
Examples of this are the Kitaev toric code, based on a lattice of spin-1/2 particles, as well as its generalisations - the Kitaev lattice model based on Hopf algebras, and the Levin-Wen model based on fusion categories.
The focus of this talk is going to be a construction allowing one to engineer a new topological order out of anyonic excitations of a given one.
This construction is an analogue of the aforementioned lattice models and is best described using a universal language of topologcial quantum field theories with defects, which we will also recall.
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| Date: | Tue, 11.10.2022 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | Sem.R. DB gelb 03 (Freihaus, TU Wien, Wiedner Hauptstrasse 8) |
| Contact: | S. Fredenhagen, D. Grumiller, E. Battista, R. Ruzziconi |
| Top-quark hadro-production and the top-quark mass |
| Speaker: | Sven-Olaf MOCH (Desy, Hamburg) |
| Abstract: | We review the current state of precision predictions for top-quark hadro-production at the Large Hadron Collider.
We discuss the accuracy of perturbative corrections in quantum chromodynamics to hard scattering processes at higher orders and explore avenues for their improvements.
The LHC cross section measurements are well suited for the extraction of the top-quark mass as a fundamental parameter of the Standard Model. |
| Date: | Tue, 11.10.2022 |
| Time: | 16:15 |
| Duration: | 60 min |
| Location: | Erwin-Schroedinger-Hoersaal, Fakultaet für Physik, Boltzmanngasse 5, 5. Stock |
| Contact: | A. Hoang, M. Procura |
| Gravitational Solitons and Complete Ricci Flat Riemannian Manifolds of Infinite Topological Type |
| Speaker: | Gilbert Weinstein (Ariel University) |
| Abstract: | I will present several new space-periodic solutions of the static vacuum Einstein equations in higher dimensions, both with and without black holes, having Kasner asymptotics. These latter solutions are referred to as gravitational solitons. Further partially compactified solutions are also obtained by taking appropriate quotients, and the topologies are
computed explicitly in terms of connected sums of products of spheres. In addition, it is shown that there is a correspondence, via Wick rotation, between the spacelike slices of the solitons and black hole solutions in one dimension less. As a corollary, the solitons give rise to complete Ricci flat Riemannian manifolds of infinite topological type and generic holonomy, in dimensions 4 and higher. This is joint work with Marcus Khuri, Martin Reiris, and Sumio Yamada. |
| Date: | Thu, 13.10.2022 |
| Time: | 15:15 |
| Duration: | 60 min |
| Location: | ZOOM https://univienna.zoom.us/j/6540036841?pwd=SytyVkZJZzNyRG9lMm13ejlHeHRRUT09 |
| Contact: | P. Chrusciel, D. Fajman |
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