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Calendar of Physics Talks Vienna
| Probing the forces of gravity, blackbody radiation and dark energy with matter waves |
| Speaker: | Philipp Haslinger (CoQuS Seminar Talk) |
| Abstract: | Atom interferometry has proven within the last decades its surprising versatility to sense with high precision tiniest forces. In this talk I will give an overview of our recent work using an optical cavity enhanced atom interferometer to sense with gravitational strength for
fifths forces1,2 and for an on the first-place counterintuitive inertial property of blackbody
radiation3.
[1] P. Hamilton, M. Jaffe, P. Haslinger, et al., Atom-interferometry
constraints on dark energy, Science. 349 (2015) 849–851.
[2] M. Jaffe, P. Haslinger, V. Xu, et al. Testing sub-gravitational
forces on atoms from a miniature, in-vacuum source mass, Nat. Phys. 13 (2017) 938–942.
[3] P. Haslinger, M. Jaffe, V. Xu, et al., Attractive force on atoms due to blackbody radiation, Nat. Phys. 14 (2018) 257–260
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| Date: | Mon, 24.06.2019 |
| Time: | 17:00 |
| Duration: | 90 min |
| Location: | TU Wien, Atominstitut, Main Lecture Hall, 1020 Vienna, Stadionallee 2 |
| Contact: | CoQuS Admin Team |
| Unconventional D-branes on T^4 |
| Speaker: | Jakub Vošmera (Institute of Physics of the Czech Academy of Sciences, Prague) |
| Abstract: | We show that apart from the conventional Dp-branes and their supersymmetric bound states, the weakly coupled type II superstring compactified on a 4-torus admits new stable non-BPS fundamental D-branes. We construct the corresponding elementary superconformal boundary states at special values of closed string moduli for which the worldsheet theory admits a Gepner-like description and check a number of BCFT consistency conditions. The open string spectrum of these new non-BPS D-branes is tachyon free despite the fact that they carry no RR charges. New explicit superconformal boundary states for certain 1/4-BPS bound states of Dp-branes are also found. |
| Date: | Tue, 25.06.2019 |
| Time: | 13:45 |
| Duration: | 60 min |
| Location: | TU Wien, Wiedner Hauptstraße 8, Yellow Area, 9th floor, Seminar Room DB 09 E23 |
| Contact: | S. Fredenhagen, D. Grumiller |
| Emission of low energy electrons from solid surfaces studied by means of spectroscopy with individual as well as correlated electrons |
| Speaker: | Vytautas Astašauskas (TU Wien, Institut für Angewandte Physik) |
| Abstract: | The work is focused on studying the secondary electron emission processes in solids with the help of several methods, based on single and double electron spectroscopy. Conventional methods, such as reflection electron energy loss spectroscopy (REELS), time-of-flight spectroscopy (TOF) is used in combination with secondary electron-electron energy loss spectroscopy and, presented for the first time, inelastic very low energy electron diffraction (IVLEED) methods. The detailed description of the whole experimental setup is given together with the measurement procedure and the explanation of the employed data evaluation. A method to retrieve a full set of electronic structure parameters that are needed to study electron emission - band gap, electron affinity, inner potential, optical constants, inelastic mean free path, is presented and is shown to work well for amorphous SiO2. The inner po |
| Date: | Tue, 25.06.2019 |
| 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: | Ao.Univ.Prof. Dr. Wolfgang Werner |
| Symmetry-breaking with competition and the Little Hierarchy |
| Speaker: | Michael E. Peskin (SLAC, Stanford University) |
| Abstract: | 5. Vorlesung im Rahmen der Erwin-Schrödinger-Gastprofessur 2019 |
| Date: | Tue, 25.06.2019 |
| Time: | 16:15 |
| Duration: | 60 min |
| Location: | Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock |
| Contact: | A. Hoang, H. Neufeld |
| Challenges and Rewards of Neutrino Hunting |
| Speaker: | Prof. Cristiano Bozza (Università degli Studi di Salerno) |
| Abstract: | Neutrinos are the most elusive among known particles. Detecting them for the first time took more than two decades. Confirming Bruno Pontecorvo's oscillation hypothesis took more than five decades and earned a Nobel prize in 2015. After a short summary of neutrino properties, the seminar will present two thriving experimental research lines. First, the picture of neutrino oscillations is still incomplete, and the experiments in the next decade are expected to answer some fundamental questions. Second, neutrinos are themselves excellent probes of physics at the largest scales and in deep space. In these years, we are witnessing the birth and first steps of neutrino astronomy. Unexpected discoveries and the first multimessenger observations of astrophysical objects are exciting challenges that call for cooperation of diverse communities of scientists. |
| Date: | Wed, 26.06.2019 |
| Time: | 17:00 |
| Duration: | 60 min |
| Location: | Stefan-Meyer-Institut, Boltzmanngasse 3, 1090 Wien, Seminarraum 3-2-08 (2. Stock) |
| Contact: | Prof. Dr. Eberhard Widmann, Dr. Martin Simon |
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