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Calendar of Physics Talks Vienna
| KKLT and the Swampland Conjectures |
| Speaker: | PD Dr. Ralph Blumenhagen (Max-Planck-Institut Munich) |
| Abstract: | In recent years a couple of so-called swampland conjectures have been proposed.
The idea is to extract a set of relatively simple features
that low-energy effective field theories should satisfy to admit
an embedding into a theory of quantum gravity.
After reviewing a couple of these conjectures, their relation to the KKLT scenario
of string moduli stabilization will be discussed. For this purpose, a couple
of so far ignored issues of the KKLT physics in a strongly warped throat will
be presented that eventually will lead to the proposal for quantum generalizations
of the AdS and dS swampland conjectures. |
| Date: | Tue, 03.03.2020 |
| Time: | 13:45 |
| Duration: | 60 min |
| Location: | TU Wien - Wiedner Hauptstraße 8 - Yellow Area, 9th floor |
| Contact: | D. Grumiller, S. Fredenhagen |
| Novel method and devices for production of highly charged ions |
| Speaker: | Andrei Nefiodov (Petersburg Nuclear Physics Institute, Department of Theoretical Physics, St. Petersburg/Russia) |
| Abstract: | It is proposed a new method for efficient production of highly charged ions. The ions are produced and confined in local potential traps formed by the rippled electron beam in a focusing magnetic field. The electron current density can reach extremely high values of the order of 10 kA/cm2 on a short length of the ion trap. Based on this method, a family of hand-size ion sources and traps with electron beam energy ranging from a few tens of eV up to a few tens of keV has been developed. The devices operate at room temperature due to the use of permanent magnets and standard vacuum techniques. The extraction of ions from the ion source can be realized in both axial and radial directions. The devices are named MaMFIS/T (main magnetic focus ion sources and traps). The novel ion sources offer many applications in atomic physics, plasma physics, solid-state physics, single ion implantation, io |
| Date: | Tue, 03.03.2020 |
| Time: | 16:00 |
| Location: | TU Wien, Institut für Angewandte Physik, E134 1040 Wien, Wiedner Hauptstraße 8-10 Yellow Tower „B“, 5th floor, SEM.R. DB gelb 05 B |
| Contact: | Univ.Prof. Dr. Friedrich Aumayr |
| Illuminating complex systems with light states made to measure |
| Speaker: | Dorian Bouchet (Utrecht University) |
| Abstract: | The use of coherent light for precision measurements has driven important progress in research fields from biomedical optics to semiconductor manufacturing. However, performing precise estimations of a given observable can be challenging due to the complex scattering processes typically encountered in realistic systems. In this talk, we show how to precisely estimate a given system observable by illuminating the system with a shaped wavefront. We first approach this question by studying the fundamental limit on the localization precision of a particle embedded in a complex scattering system. We then introduce a general method to generate states of light optimized for parameter estimation, which we illustrate by determining the phase of an object that is hidden behind a disordered medium. |
| Date: | Wed, 04.03.2020 |
| Time: | 14:15 |
| Duration: | 45 min |
| Location: | seminar room, tenth floor, yellow section, Freihaus, TU Wien |
| Contact: | stefan.rotter@tuwien.ac.at |
| The Fingerprints of Black Holes- Shadows and their Degeneracies |
| Speaker: | Claudio Paganini (Max-Planck-Institut, Potsdam) |
| Abstract: | With the advent of the first picture of a black hole taken by the Event Horizon Telescop collaboration we entered a new age of black hole research. In my talk I will ask,how much information an observer can hope to retrieve, at best, from such observations.
First I will introduce the concept of the shadow of a black hole and what it means for the shadows of two observers to be degenerate. I will then show that no continuous degenerations exist between the shadows of observers at any point in the exterior region of any Kerr-Newman black hole spacetime of unit mass and hence all parameters can in principle be extracted from an observation.
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| Date: | Thu, 05.03.2020 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | Arbeitsgruppe Gravitation, Währinger Strasse 17, Raum 218, 2. Stock, 1090 Wien |
| Contact: | D. Fajman |
| Impurities in a Fermi sea of ultracold atoms |
| Speaker: | Isabella Fritsche (Universität Innsbruck) |
| Abstract: | Ultracold quantum gases offer a well-controllable environment to study the phases and dynamics of multicomponent mixtures. The intra- and interspecies scattering lengths can be conveniently tuned from the weak to the strongly interacting regime with the aid of Feshbach resonances. In our dual-species experiment we study the properties of a small Potassium cloud (either fermionic or bosonic) immersed in a Fermi sea of Lithium atoms.
I will briefly introduce our early work on polarons with fermionic impurities (40K). Then I will introduce the Fermi-Bose experiments and report on the occurrence of a phase separation where we investigated the static and dynamic properties of the two strongly interacting atomic species. In the last part of the talk, I will discuss our ongoing research involving reduced boson densities, which finally connects to polaron physics in the limit of single-impurity. |
| Date: | Thu, 05.03.2020 |
| Time: | 15:30 |
| Location: | Atominstitut, Stadionallee 2, 1020 Wien - Hörsaal |
| Contact: | P. Haslinger |
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