Calendar of Physics Talks Vienna

CoQuS colloquium with Ulrich Schneider, University of Cambridge
Speaker:Ulrich Schneider & CoQuS student Rui Vasconcelos (CoQuS)
Abstract:Talk from Ulrich Schneider: Exploring quantum thermalization and its breakdown using ultracold atoms in optical lattices.
Date: Mon, 10.12.2018
Time: 17:00
Location:Lise-Meitner Lecture Hall, Boltzmanngasse 5, 1090 Vienna
Contact:CoQuS office

Gravity as graded spacetime (quantum) mechanics
Speaker:Peter Schupp (Jacobs Univ. Bremen)
Abstract:Electromagnetic interactions can be introduced by a deformation of the canonical commutation relations, as a slightly more general alternative to the usual minimal coupling prescription. We show that the same is true for gravitational interactions, but graded manifolds are required. As an application we present a slick derivation of the bosonic part of the supergravity (string effective) action. The construction provides a novel, somewhat more algebraic interpretation of the key ingredients of general relativity. The mathematical setting is Hitchin's generalized geometry.
Date: Tue, 11.12.2018
Time: 13:45
Duration: 60 min
Location:TU Wien, Getreidemarkt 9, Maschinenbaugebäude, 1. Stock, HS Kleiner Schiffbau
Contact:S. Fredenhagen, D. Grumiller

Unrevealing the corrosion mechanism in nanometer confined gaps using white light interferometry in reflection and transmission mode
Speaker:Claudia Merola (TU Wien, Institut für Angewandte Physik)
Abstract:Nickel and nickel alloys, because of their versatility and corrosion resistance, are used in a broad-range of applications, however they still undergo the corrosion process under aggressive environments. It is our interest to have a deeper understanding of the starting mechanism of crevice corrosion. Herein we have developed an electrochemical surface forces apparatus (1) extended to function in reflection mode (EC-rSFA), hence, we successfully extend the interferometry technique from transparent thin film materials to polished bulk materials within the SFA. Post experiment analysis was performed to characterize the corroded area with atomic force microscopy, optical microscopy, x-ray Laue nanodiffraction, and XPS. To get a complete overview of the corrosion phenomenon, oxygen saturated/depleted conditions were reproduced in a flow cell for use with downstream ICP-MS detection of corrosi
Date: Tue, 11.12.2018
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. Markus Valtiner

Standard Model parton distributions at very high energies
Speaker:Bryan Webber (Cavendish Lab, Cambridge)
Abstract:At energies far above the electroweak scale, electroweak symmetry is restored and the parton distribution functions of the proton receive contributions from all the Standard Model fermions and bosons. Fundamentally new phenomena appear, such as self-polarisation, mixed PDFs and double-logarithmic evolution. I will discuss the evolution of the 60 SM PDFs of the unpolarised proton according to the SU(3), SU(2), U(1), mixed SU(2)×U(1) and Yukawa interactions, and show that it can lead to important corrections to parton luminosities at a future 100 TeV collider.
Date: Tue, 11.12.2018
Time: 16:15
Duration: 60 min
Location:Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock
Contact:A. Hoang, H. Neufeld, S. Plätzer, M. Procura

From quantum reference systems to quantum general covariance
Speaker:Philipp Höhn (ESI)
Abstract:Despite its importance in general relativity, a quantum notion of general covariance has not yet been established in quantum gravity and cosmology, where, given the a priori absence of coordinates, it is necessary to replace classical frames with dynamical quantum reference systems. As such, quantum general covariance bears on the ability to consistently switch between the descriptions of the same physics relative to arbitrary choices of quantum reference systems. In this talk, I will summarize a recent systematic method for such switches, which works in analogy to coordinate changes on a manifold, except that these `quantum coordinate changes' proceed between different Hilbert spaces. I will illustrate this method by means of spatial quantum reference frames and a simple quantum cosmological model. Time permitting, I might also disucss conceptual implications for quantum gravity.
Date: Thu, 13.12.2018
Time: 14:00
Duration: 60 min
Location:Arbeitsgruppe Gravitation, Währinger Strasse 17, Raum 218, 2. Stock, 1090 Wien
Contact:P.T. Chrusciel, D. Fajman