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Calendar of Physics Talks Vienna
| Welcome to the MaZe, a new approach for simulating adiabatic systems |
| Speaker: | Sara Bonella (CECAM, EPF Lausanne) |
| Abstract: | In several domains of physics, including first principles simulations and classical models for polarizable systems, the minimization of an energy function with respect to a set of auxiliary variables must be performed to define the dynamics of physical degrees of freedom. In this talk, a recent and effective formalism to simulate this type of systems will be discussed: the Mass-Zero (MaZe) Constrained Dynamics [1]. In MaZe the minimum condition is imposed as a constraint on the auxiliary variables treated as degrees of freedom of zero inertia driven by the physical system. The method is formulated in the Lagrangian framework, enabling the properties of the approach to emerge naturally from a fully consistent dynamical and statistical viewpoint [2].
Several examples of current uses of MaZe will be rapidly presented. |
| Date: | Tue, 07.03.2023 |
| Time: | 13:15 |
| Duration: | 60 min |
| Location: | Erwin Schrödinger Institute, Boltzmann Lecture Hall, Boltzmanngasse 9, 1090 Wien |
| Contact: | Erwin Schrödinger Institute, University of Vienna |
| Three-dimensional gravity in the BV-BFV formalism |
| Speaker: | Giovanni Canepa (University of Vienna) |
| Abstract: | In this talk I will give a brief introduction to the BV-BFV formalism for quantum field theories.
Subsequently, I will present the BV-BFV formulation of three-dimensional general relativity in
the Einstein Cartan variables and draw a connection with BF and Chern-Simons theories.
This talk is based on arXiv:1905.09333, a joint work with Michele Schiavina. |
| Date: | Tue, 07.03.2023 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | TU - Sem.R. DB gelb 03 (Freihaus, TU Wien, Wiedner Hauptstrasse 8) |
| Contact: | S. Fredenhagen, D. Grumiller, E. Battista, R. Ruzziconi |
| Phase transitions and self assembly in active matter |
| Speaker: | Ignacio Pagonabarraga (University of Barcelona) |
| Abstract: | Flocks of birds, schools of fishes, or bacterial colonies constitute examples of living systems that coordinate their motion. In all these systems their constituent elements generate motion due to energy consumption and can exchange information or react sensitively to chemical cues in order to move together or to react collectively to external signals. Artificial systems, such as nanorobots, exploit the heterogeneous compositions of their surface to displace as a result of the heterogeneous chemical processes that take place in the presence of appropriate chemical substances.
All these systems are intrinsically out of equilibrium in the absence of any external driving. Therefore, their collective properties result as a balance between their direct interactions and the indirect coupling to the medium in which they displace, and a self-consistent dynamical approach is required. |
| Date: | Tue, 07.03.2023 |
| Time: | 14:15 |
| Duration: | 60 min |
| Location: | Erwin Schrödinger Institute, Boltzmann Lecture Hall, Boltzmanngasse 9, 1090 Wien |
| Contact: | Erwin Schrödinger Institute |
| Speaker: | Stefan Hollands (Leipzig) |
| Abstract: | The strong cosmic censorship hypothesis asserts that the inner horizons of Kerr-Newman(-deSitter) black holes are unstable against classical perturbations,
thus effectively eliminating any problems with causality and determinism associated with the regions beyond the inner horizon.
I discuss the status of this conjecture and emphasise the importance of quantum effects to avoid violations of strong cosmic censorship in the presence of a (positive) cosmological constant. |
| Date: | Thu, 09.03.2023 |
| Time: | 15:30 |
| Duration: | 60 min |
| Location: | via zoom https://univienna.zoom.us/j/6540036841?pwd=SytyVkZJZzNyRG9lMm13ejlHeHRRUT09 |
| Contact: | P. Chrusciel, D. Fajman |
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