Calendar of Physics Talks Vienna

Revisiting cosmological applications of electromagnetic cascade theory
Speaker:Pasquale Dario Serpico
Abstract:Abstract: After a recap of the standard e.m. cascade theory, I will discuss a loophole that can have a large effect in the early universe, notably in altering primordial nucleosynthesis bounds on electromagnetically decaying relic particles. I will finally show how this may greatly simplify the possibility to address the long-standing "lithium problem" in terms of new physics models.
Date: Tue, 24.11.2015
Time: 11:00
Duration: 60 min
Location:Library, HEPHY, Nikolsdorfer Gasse 18, 1050 Wien

Addressing T cell receptor stoichiometry with single molecule fluorescence microscopy
Speaker:Dr. Mario Brameshuber (TU Wien, Insitut für Angewandte Physik, AG Biophysik)
Abstract:T lymphocytes play an important role in adaptive immune responses, where they detect antigen on the plasma membrane of antigen presenting cells (APCs) leading to subsequent elimination of foreign pathogens. Discrimination between potentially harmful foreign and self-peptides is performed by the T cell receptor (TCR) with incredibly high sensitivity and specificity. The TCR is a multi-molecular protein complex accompanied by a long lasting controversy about its stoichiometry, which is of major importance for building accurate models about initiation of T cell signaling. By using an in-house developed single molecule FRAP (fluorescence recovery after photo bleaching) approach we show that the mobile fraction of fluorescently labeled TCR is exclusively monomeric in resting primary murine T cells adhering to a lipid bilayer system mimicking APCs. This result was confirmed employing a complem
Date: Tue, 24.11.2015
Time: 16:00
Location:Technische Universität Wien, Institut für Angewandte Physik, E134 yellow tower „B“, 5th floor, Sem.R. DB gelb 05 B (room number DB05L03) 1040 Wien, Wiedner Hauptstraße 8-10
Contact:Univ.Prof. Dr. Gerhard Schütz

Flat Space Holographic Entanglement Entropy
Speaker:Daniel Grumiller (TU Wien)
Abstract:im Rahmen des Teilchenphysikseminars
Date: Tue, 24.11.2015
Time: 16:15
Duration: 60 min
Location:Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock
Contact:H. Hüffel, H. Neufeld

Optical Coherence Tomography
Speaker:Prof. Dr. Christoph K. Hitzenberger
Date: Tue, 24.11.2015
Time: 17:30
Duration: 60 min
Location:Lise-Meitner Hörsaal (ehemal. Großer Hörsaal der Experimentalphysik), Universität Wien
1090 Wien, Strudlhofgasse 4 / Boltzmanngasse 5

Fano Resonances in Novel Quantum Materials
Speaker:Alexander V. Boris (Max Planck Institute for Solid State Research, Stuttgart, Germany)
Abstract:Fano interference, known as the quantum-mechanical interaction between continuum and embedded discrete states, is one of the most fundamental phenomena occurring in various exotic quantum phases, including graphene, spin–orbit Mott insulators, low-dimensional semiconductors, etc. In my talk, I will focus on two specific examples: (i) the observation of Fano resonances in the infrared spectra of phonons in hyper-Kagome Na3Ir3O8, and (ii) Fano interference in the excitonic insulator phase in ternary chalcogenides Ta2NiSe5. https://www.ifp.tuwien.ac.at/www.ifp.tuwien.ac.at/fileadmin/seminar/151125_Boris_abs.pdf
Date: Wed, 25.11.2015
Time: 16:00
Duration: 45 min
Location:Seminarraum DC rot 07 (roter Bereich, 7. OG), Wiedner Hauptstraße 8-10, 1040 Wien
Contact:Andrei Pimenov

Memorable Events in Fields, Gravity and Strings
Speaker:Soo-Jong Rey (Seoul National University & Institute for Basic Sciences, South Korea)
Abstract:100 years after Einstein's discovery of General Relativity the field provides an abundance of novel research directions. In this colloquium we focus on a specific one, gravitational memory. Registering events are in general difficult for classical fields, exceedingly difficult for gravity, and deemed unimaginably difficult for strings. In this colloquium, I present undergraduate-level elementary and highly intuitive arguments for how such event memory can be registered in a simple manner. I then relate the key idea to so-called Weinberg's low-energy soft theorems and to novel (asymptotic) symmetry charges. I argue that event memories can be registered by utilizing SQUID for electromagnetic fields and D-branes for strings.

This is the public talk of the conference Vienna Central European Seminar with the topic "Quantum & Gravity".

Date: Fri, 27.11.2015
Time: 18:15
Duration: 90 min
Location:Ernst-Mach lecture hall (2nd floor), University of Vienna (Boltzmanngasse 5)
Contact:Daniel Grumiller