Calendar of Physics Talks Vienna

Single-site-resolved detection and manipulation of atoms in an optical lattice
Speaker:Stefan Kuhr (Max-Planck Institut für Quantenoptik, Garching)
Abstract:Ultracold quantum gases in optical lattices have led to a convergence between atomic physics and condensed matter physics. To fully exploit the potential of ultracold atoms as a quantum simulator it is of great advantage to precisely measure the in-trap atom distribution in order to fully characterize the quantum many-body states. I will report on our recent fluorescence imaging of bosonic Mott insulators in an optical lattice with single-atom and single-site resolution. From our images, we are able to fully reconstruct the atom distribution on the lattice and identify individual thermal excitations with high fidelity, giving access to a precise in-situ temperature and entropy measurement. Finally, I will present our latest progress towards addressing and manipulation of individual lattice sites.
Date: Mon, 15.11.2010
Time: 17:30
Duration: 60 min
Location:Univ. Wien, Ernst-Mach-Hörsaal, Strudlhofgasse 4, 2nd floor, 1090 Wien
Contact:Prof. Arno Rauschenbeutel/Prof. Jörg Schmiedmayer

Quantum Technology: Putting Weirdness to Use
Speaker:Professor Dr. Christopher Monroe (University of Maryland)
Abstract:Quantum information science in the 21st century links two pillars of 20th century thought: information theory and quantum mechanics. This new field exploits the bizarre features of quantum mechanics -- uncertainty, entanglement, and measurement -- to perform tasks that are impossible using conventional means. We anticipate that exotic quantum hardware such as individual trapped atoms, quantum dots in solids, and superconducting loops of wire will not only find there way into 21st century technology, but they will also bring quantum weirdness to the forefront and stimulate new ways of thinking about foundational aspects of the physical world.
Date: Mon, 15.11.2010
Time: 17:30
Duration: 50 min
Location:Großer Festsaal der Universität Wien Dr. Karl-Lueger-Ring 1 1010 Wien
Contact:Alexandra Seiringer

Topologically Massive Gravity
Speaker:Sabine Ertl (TU Wien)
Abstract: Topologically Massive Gravity (TMG) is quite an old theory in the field of 3 dimensional gravity. Despite age its attraction was recovered over the last few years as a possible toy model for quantum gravity. Its interesting features provide us with various kinds of vacuum and black hole solutions. One particular way of finding solutions to this theory is by considering its stationary axi-symmetric case, which is then nothing else than a particle-mechanics problem. This dimensionally reduced theory is then called Topologically Massive Mechanics (TMM). In this talk I will motivate three dimensional gravity and discuss general features of TMG. The main focus will be in finding and discussing solutions of TMG via the TMM approach. Schedule Overview
Date: Tue, 16.11.2010
Time: 12:30
Duration: 60 min
Location:Uni Wien ( Boltzmanngasse 5, 5th floor, Schrödinger HS / large seminar room )
Contact:Niklas Johansson

Laser Spectroscopy of Hydrogen
Speaker:The Nobel Laureate Professor Dr. Theodor W. Hänsch (Max-Planck-Institute of Quantum Optics, Garching, and Faculty of Physics, Ludwig-Maximilians-University, Munich, Germany)
Abstract:The simple Balmer spectrum of atomic hydrogen has provided the Rosetta stone for deciphering the strange laws of quantum physics during during the early 20th century. Four decades ago, Doppler-free laser spectroscopy opened a new chapter in the exploration of hydrogen. Today, precision spectroscopy of hydrogen is reaching a precision of 15 decimal digits with the help of new spectroscopic tools including the laser frequency comb technique. However, the determination of fundamental constants and experimental tests of fundamental physics laws are now hindered by our insufficient knowledge of the rms charge radius of the proton. Recently, a laser measurement of the 2S-2P Lamb shift of muonic hydrogen has yielded an independent precise new value of the proton radius which differs by five old standard deviations from the official CODATA value. This discrepancy is subject of intense current discussions. It may be caused by a mistake, or it may indicate a dent in the armor of quantum electrodynamic theory.
Date: Tue, 16.11.2010
Time: 15:00
Duration: 45 min
Location:Fakultät für Physik der Universität Wien Lise Meitner Hörsaal, 2. Stock Boltzmanngasse 5 1090 Wien
Contact:Daniela Charlesworth

Emergent space and general relativity from tensor models and possibility of emergent gauge fields and fermion
Speaker:Prof. Naoki Sasakura (Kyoto Univ.)
Date: Tue, 16.11.2010
Time: 16:15
Duration: 60 min
Location:Fakultät für Physik, Erwin Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock, 1090 Wien
Contact:Harold Steinacker

Studies of antikaon interactions with nucleons at DAFNE
Speaker:Oton Vazquez Doce
Abstract:The AMADEUS experiment is the proposal presented at the DAFNE collider to investigate the antikaon-nucleon potential in the nuclear enviroment, and it is being preceded by the study of the hadronic interac-tions of K- in the 4He of the drift chamber of KLOE. The advantage of the AMADEUS proposal resides in the use of the large drift chamber of KLOE and the almost full acceptance calorimeter. As an exploratory measurement, we are investigating the hadronic inter-actions of K- in the drift chamber (DC) from past KLOE runs. Being the DC gas composed mainly by helium, 0.1% of the K- should be stopped in the gas, giving an unique scenario to study the developed hadronic interacti-ons in such an "active target". Preliminary results of the analysis of a sample of 1.7 fb-1 of 2005 KLOE data are presented paying attention to the comparison with the recently developed Monte Carlo distributions for classical processes.
Date: Wed, 17.11.2010
Time: 16:00
Duration: 60 min
Location:SMI, Seminar room, Boltzmanngasse 3, 1090 Wien, Room 2.08
Contact:Roland Gsell

Dark matter and lepton flavour violation in seesaw models
Speaker:Jorge C. Romao (Lisboa, CFTP)
Abstract:im Rahmen des Teilchenphysikseminars
Date: Thu, 18.11.2010
Time: 14:15
Duration: 60 min
Location:Fakultät für Physik, Erwin Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock
Contact:A. Bartl, H. Neufeld

Gravity in 2D and 3D
Speaker:Daniel Grumiller (TU Wien)
Date: Fri, 19.11.2010
Time: 14:00
Location:Seminarraum E 136, 10. Stock, Freihaus Turm B (gelb), Wiedner Hauptstr. 810, 1040 Wien
Contact:Anton Rebhan

Is Gravity an Entropic Force?
Speaker:Helmut Rumpf (Univ. Wien) (Fakultät für Physik)
Abstract:im Rahmen der gemeinsam veranstalteten Seminare "Komplexe Stochastische Systeme" (Univ.Wien) und "Analyse Komplexer Systeme" (Medizinische Universität Wien)
Date: Fri, 19.11.2010
Time: 14:30
Duration: 90 min
Location:Erwin Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock, 1090 Wien
Contact:H. Hüffel