CPT

Calendar of Physics Talks Vienna

Three projects at the Joint Quantum Institute: Francium, Cavity QED,
Speaker:Luis A. Orozco (Joint Quantum Institute, NIST and Dept. Phys.)
Abstract:Three projects at the Joint Quantum Institute: Francium, Cavity QED, and Nanofibers I will report on recent developments on three projects: 1) Francium spectroscopy where we perform precision spectroscopy on francium to carry out experiments to understand better the weak interaction, 2) Cavity QED as a tool to study questions on quantum speed and its control that are relevant in statistical mechanics and quantum information 3) Optical nanofibers where we have been able to measure the modification of the atomic lifetime of Rb atoms due to collective effects. The National Science Foundation of the USA has supported this work.
Date: Mon, 23.10.2017
Time: 14:30
Location:Atominstitut, Hörsaal, Stadionallee 2, Wien 2
Contact:Arno Rauschenbeutel

BMS4 at spatial infinity
Speaker:Cedric Troessaert (MPI für Gravitationsphysik, Potsdam)
Abstract:A few years ago Strominger argued that the BMS4 algebra, usually defined at null infinity, should be regarded as a true symmetry of gravitational evolution of asymptotically flat space-times. This implies the existence of an infinite tower of conserved quantities and brings new insight to various problems like gravitational scattering or black-holes evaporation. In this talk, I will show how BMS4 algebra arises as a symmetry at spatial infinity.
Date: Tue, 24.10.2017
Time: 14:00
Duration: 60 min
Location:TU Wien, Freihaus, SEM 136, 10. Stock, Wiedner Hauptstr. 8-10, 1040 Wien
Contact:S. Fredenhagen, D. Grumiller

A composite model for B decay anomalies and dark matter
Speaker:Prof. James Cline (McGill University)
Abstract:The LHCb experiment has found tentative evidence for the breakdown of lepton flavor universality in decays of neutral B mesons to K (or K^*) plus leptons. Exchange of a heavy leptoquark is one way to explain the observations. I present a simple model where the leptoquark, along with heavy quark and lepton partners and a TeV-scale dark matter candidate, arise from strong interactions of a new SU(N) confining gauge interaction. The model predicts other flavor-changing rare processes, direct detection of the dark matter, and production of the heavy states at LHC. It can also explain the anomalous magnetic moment of the muon if the new confinement scale is ~100 GeV.
Date: Tue, 24.10.2017
Time: 14:00
Duration: 60 min
Location:HEPHY Library
Contact:Josef Pradler

New Eyes for Nanocatalysis: Atomic Scale Investigations of TiO2 Chemistry
Speaker:Melissa A. Hines (Dept. of Chemistry and Chemical Biology, Cornell University/USA)
Abstract:The arrangement of atoms on a catalyst surface controls its chemical reactivity. As a result, nanocatalysts with different shapes — and thus different surfaces — often have markedly different reactivities, which has led to the emergence of shape-controlled chemistry. Nevertheless, predicting which faces, and thus which shapes, will be the most reactive under operating conditions has been hindered by our inability to image these tiny crystals at the atomic scale. I will show that shape-controlled crystal growth techniques can be used to produce highly aligned anatase TiO2 nanocrystals that can be studied at the atomic-scale with scanning tunneling microscopy and a panoply of other techniques. Despite being synthesized in solution, the surfaces of the nanocrystals are very clean and passivated by a protecting monolayer. Using these crystals, I will show that the most commonly used function
Date: Tue, 24.10.2017
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. Ulrike Diebold

Computing Long-Distance Contributions in Flavour Physics
Speaker:Christopher T. Sachrajda (University of Southampton)
Abstract:3. Vorlesung im Rahmen der Schrödinger-Gastprofessur 2017
Date: Tue, 24.10.2017
Time: 16:15
Duration: 60 min
Location:Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock
Contact:A. Hoang, H. Neufeld, G. Ecker