|
Calendar of Physics Talks Vienna
| Speaker: | Roberto Emparan (U. Barcelona) |
| Abstract: | I will discuss ongoing work with Jorge Rocha and Umpei Miyamoto to understand the violation of cosmic censorship in the evolution and break up of black strings.
|
| Date: | Tue, 06.06.2017 |
| Time: | 11:00 |
| Duration: | 60 min |
| Location: | ESI, Boltzmann lecture hall |
| Contact: | Daniel Grumiller |
| The Sensitivity of Black Holes to Low Energy Excitations |
| Speaker: | Suvrat Raju (ICTS, Mumbai) |
| Abstract: | A general principle of statistical mechanics is that low energy excitations of a thermal state change expectation values of observables by a very small amount. However some observables in the vicinity of the horizon of a large black hole in anti-de Sitter space naively seem to violate this bound. This potential violation is related to the question of whether the black hole interior can be described in AdS/CFT. Here we point out that if the possible excitations are limited to those produced by a simple local source on the boundary, and the possible observables are limited to products of field operators in a single causal patch in the bulk, then these violations disappear. |
| Date: | Tue, 06.06.2017 |
| Time: | 15:00 |
| Duration: | 60 min |
| Location: | ESI, Boltzmann lecture hall |
| Contact: | Daniel Grumiller |
| Measurement of Hawking Radiation in the lab |
| Speaker: | Bill Unruh (British Columbia U.) |
| Abstract: | Hawking's result that black holes radiate is one of the most mysterious results in physics in the past 50 years. 40 years later we still do not understand the process or its implications. About 35 years ago I noticed that the same effect is present in fluids with transsonic flows, which opened the way to doing laboratory experiments to investigate the physics of the process. I will discuss the Hawking process, and the problems in its derivation, the analog models and the experiments which have and are being done to measure the effect in a variety of fluids and of waves in those fluids. |
| Date: | Wed, 07.06.2017 |
| Time: | 11:00 |
| Duration: | 60 min |
| Location: | ESI, Boltzmann lecture hall |
| Contact: | Daniel Grumiller |
| Speaker: | Arjun Bagchi (IIT, Kanpur) |
| Date: | Wed, 07.06.2017 |
| Time: | 15:00 |
| Duration: | 60 min |
| Location: | ESI, Boltzmann lecture hall |
| Contact: | Daniel Grumiller |
| The langasite A3BC3Si2O14 with magnetic ions on a triangle lattice: a play ground for magnetic frustration, chirality and multiferroicity |
| Speaker: | Sophie De Brion (Institut NEEL, Grenoble, France) |
| Abstract: | In the langasites A3BC3Si2O14, both the A and C sites present the same network based on triangles where magnetic frustration may occur. Additional ingredients are at play depending on the nature of the magnetic ions. In this talk I will review the properties of two families. The first one deals with a 3d ion and strong magnetic
interactions: the iron langasite where a chiral magnetic structure occurs. This compound shows also multiferroic properties as well as an original THz magnetoelastic response. In the case of Nd and Pr langasites, no long range order is detected and I will discuss possible spin liquid behavior and effects of crystal field excitations. |
| Date: | Wed, 07.06.2017 |
| Time: | 16:00 |
| Duration: | 45 min |
| Location: | Seminarraum DC rot 07 (Freihaus, roter Bereich, 7. OG), Wiedner Hauptstraße 8-10, 1040 Wien |
| Contact: | Anna Pimenov |
| Speaker: | Joseph Silk (Université Pierre et Marie Curie, Paris; Johns Hopkins University; University of Oxford) |
| Abstract: | One of our greatest challenges in cosmology is understanding the origin of the structure of the universe, and in particular the formation of the galaxies. I will describe how the fossil radiation from the beginning of the universe, the cosmic microwave background, has provided a window for probing the initial conditions from which structure evolved and seeded the formation of the galaxies, and the outstanding issues that remain to be resolved. I will address our optimal choice of future strategy in order to make further progress on understanding our cosmic origins. |
| Date: | Thu, 08.06.2017 |
| Time: | 13:00 |
| Duration: | 60 min |
| Location: | Atominstitut Hörsaal, Stadionallee 2, 1020 |
| Contact: | josef.pradler@oeaw.ac.at, anton.rebhan@tuwien.ac.at |
| Aspects Of Non-Markovianity In Quantum Walks |
| Speaker: | Subhashish Banerjee (Indian Institute of Technology Jodhpur, India) |
| Abstract: | After motivating the need for a study of Open Quantum Systems, we introduce, briefly, quantum operations and use it to discuss a few well known noise processes. We then move to some recent developments in the efforts to understand non-Markovian phenomenon. Our discussion about non-Markovian behaviour will be made in the backdrop of some well-known non-Markovian processes. We show how different sources of non-Markovianity could be disambiguated. All this is done using the platform of Quantum Walks. |
| Date: | Fri, 09.06.2017 |
| Time: | 09:45 |
| Location: | Seminar room FH DA green 06A, TU Wien - Vienna University of Technology, Wiedner Hauptstraße 8 – 10, 6th floor, A (green tower) |
| Contact: | Himadri Shekhar Dhar |
| TeV scale MSSM Dark Matter and the elektroweak Sommerfeld effect |
| Speaker: | Martin Beneke (TU München) |
| Abstract: | im Rahmen des Teilchenphysikseminars |
| Date: | Fri, 09.06.2017 |
| Time: | 16:15 |
| Duration: | 60 min |
| Location: | Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock |
| Contact: | A. Hoang, H. Neufeld |
|