CPT

Calendar of Physics Talks Vienna

„Linear versus Non-linear Supersymmetry“
Speaker:Niccolò Cribiori (TU Wien)
Abstract:If realized in Nature, supersymmetry has to be spontaneously broken at some energy scale above the TeV. When spontaneously broken, it can become non-linearly realized. In this talk I will analyze the properties of models with spontaneously broken and non-linearly realized, global and local supersymmetry in four dimensions. A systematic procedure is going to be given for constructing generic effective theories with any desired spectrum content and applications to supergravity and de Sitter uplifts will be discussed.
Date: Tue, 06.11.2018
Time: 13:45
Location:Erwin Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock
Contact:S. Fredenhagen, D. Grumiller,

Water-oxidation on hematite: insights and some remaining challenges
Speaker:Anders Hellman (Chalmers University of Technology, Department of Physics and the Competence Centre for Catalysis, Sweden)
Abstract:Hematite is considered a promising material for the water-oxidation reaction. This fact is not surprising given that (i) hematite can theoretically absorb up to 40% of solar radiation, (ii) it shows excellent (photo)electrochemical stability in a pH range from 3 to 14, and (iii) iron is the fourth most abundant element in the Earth's crust. However, so far the reported solar-to-hydrogen conversion efficiency is far from the theoretical limit [1]. Major factors hampering the performance of Fe2O3 are high recombination rate and poor oxygen evolution kinetics [2]. Here, I will account for some of our latest effort in understanding the water-oxidation reaction on hematite [3-6]. It will range from comments on the modeling methodology to details of how to improve the reaction kinetics with the help of dopants and intrinsic electric fields. More importantly, I will highlight some of the rem
Date: Tue, 06.11.2018
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. Ulrike Diebold

New Physics in the Higgs Sector – An Effective Theory Approach
Speaker:Gerhard Buchalla (Uni München)
Abstract:The properties of the Higgs boson will be investigated with increasing precision during the coming years in order to probe the dynamics of electroweak symmetry breaking.While the Higgs couplings are compatible with the Standard Model at present, deviations of order 10% or more are currently still allowed. With the precision goal for Higgs couplings of a few percent at LHC Run II and III, it will be possible to test a scenario, in which anomalous Higgs couplings are the dominant effects of new physics in the electroweak sector. Such a scenario leads to an effective field theory (EFT) that has the form of an electroweak chiral Lagrangian, including a light Higgs. We discuss the systematics and the power counting of this approach, its relation to an EFT organized in terms of the canonical dimension of operators, and phenomenological applications. We discuss in particular how the . . . .
Date: Tue, 06.11.2018
Time: 16:15
Duration: 60 min
Location:Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock
Contact:A. Hoang, H. Neufeld

Effective few-mode theories for ab-initio cavity QED
Speaker:Dominik Lentrodt (Max Planck Institute for Nuclear Physics, Heidelberg)
Abstract:The Jaynes-Cummings model, as well as its many generalizations, has been an indispensable tool in studying the quantum dynamics of light-matter interactions. In particular in cavity and circuit QED, where strong light-matter coupling is routinely achieved in experiment, the model has been tremendously successful. At its core lies the assumption of a single perfect cavity mode; multiple modes, loss and scattering are usually added phenomenologically. Recently, however, various experimental platforms have emerged, where these factors constitute an essential part of the physics. In this talk we will present an ab-initio method to construct few-mode Hamiltonians where loss and scattering are treated systematically. This allows us to include new physics into Jaynes-Cummings type models, without abandoning their conceptual and computational simplicity. We will outline some implications, …
Date: Wed, 07.11.2018
Time: 14:15
Location:Seminar room FH gelb 10, Institute for Theoretical Physics – Vienna University of Technology, Wiedner Hauptstraße 8 – 10, 10th floor, B (yellow tower)
Contact:Stefan Rotter

Non-spherically symmetric collapse in asymptotically AdS spacetimes
Speaker:Pau Figueras (Queen Mary College, London)
Abstract:im Rahmen des Literaturseminars für Gravitationsphysik: In this talk I’m going to present our recent studies on gravitational collapse in asymptotically anti-de Sitter spacetimes away from spherical symmetry. Starting from initial data sourced by a massless real scalar field, we solve the Einstein equations with a negative cosmological constant in five spacetime dimensions and obtain a family of non-spherically symmetric solutions, including those that form two distinct black holes on the axis. We find that these configurations collapse faster than spherically symmetric ones of the same mass and radial compactness. Similarly, they require less mass to collapse within a fixed time.
Date: Thu, 08.11.2018
Time: 14:00
Duration: 60 min
Location:Arbeitsgruppe Gravitation, Währinger Strasse 17, Raum 218, 2. Stock, 1090 Wien
Contact:P.T. Chrusciel, D. Fajman

Microwave Sensors and Sensor Systems for Accelerators
Speaker:Friedhelm Caspers, CERN EP-UGC (CERN EP-UGC)
Abstract:For diagnostic applications of charged particle beams in circular and linear accelerators a considerable number of elements and systems were developed over the last 80 years. Here the discussion is mainly focused on electromagnetic sensors which refer to structures interacting with the image current of the beam on the inner surface of the vacuum chamber and which are not intercepting the beam. Also synchrotron light emitted by any changed particle on a curved trajectory in the frequency range from about 1 GHz up to very hard gamma rays plays an important role in beam diagnostics. Classical electromagnetic sensors include wall current monitors capacitive pick-ups and a large family of directional coupler like structures for measurements of longitudinal and transverse emittance, tune and chromaticity . Beam induced signals can be divided into coherent and incoherent signals, where for th
Date: Fri, 09.11.2018
Time: 15:30
Duration: 45 min
Location:TU Wien, Atominstitut, Hörsaal
Contact:Hartmut Abele