Calendar of Physics Talks Vienna

Pre-hospital Stroke Diagnosis with Non-Invasive Transcranial Ultrasound
Speaker:Maximilian Dirnbacher MSc. (TU Wien, IAP & BURL Concepts, Inc., San Diego, CA/USA)
Abstract:A stroke is a devastating neurovascular event that happens worldwide to over 15 million people each year. The figure of speech “Time is Brain” should point out the critical factor of time when it comes to diagnosis and treatment. As stroke progresses, two-thirds of stroke victims suffer from severe damages, such as speech disorder or paralysis, whereas for the remaining one-third it may lead to death. Family members and friends of the survivors have to deal with the relentless consequences, too. Needless to say that this emphasizes the importance to develop innovative, affordable medical care solutions for present and future generations to battle strokes. One promising, non-invasive, stroke diagnosis approach, a portable transcranial ultrasound platform, is currently being developed at the company BURL Concepts, Inc., located in Southern California. This device uses ultrasound waves in c
Date: Tue, 08.03.2016
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:Ao.Univ.Prof. Dr. Martin Gröschl

An Effective Theory for Jet Processes
Speaker:Thomas Becher (Univ. Bern)
Abstract:im Rahmen des Teilchenphysiksemimars: Processes involving narrow jets receive perturbative corrections enhanced by logarithms of the jet opening angle and the ratio of the energies inside and outside the jets. In my talk I’ll present a new effective field theory which fully separates the physics at the different energy scales relevant in such processes. This makes it for the first time possible to systematically resum the logarithmically enhanced corrections to jet cross section to all orders.
Date: Tue, 08.03.2016
Time: 16:15
Duration: 60 min
Location:Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock
Contact:A. Hoang, H. Neufeld

Interfacial dynamics and synergistic effects in nanocarbon-inorganic hybrid photocatalysts
Speaker:Univ.Prof. Dr. Dominik Eder (Technische Universität Wien, Institut für Materialchemie)
Abstract:Vortrag Eder
Date: Tue, 08.03.2016
Time: 17:30
Duration: 60 min
Location:Fakultät für Physik, Lise-Meitner-Hörsaal, Boltzmanngasse 5, 1. Stock

Secondary index theory, positive scalar curvature and torsion in the fundamental group
Speaker:Rudolf Zeidler (U Göttingen)
Abstract:Secondary index invariants have found many fruitful applications in geometric topology, in particular to the study of the space of positive scalar curvature metrics. In this talk, we will give an exposition on how secondary index theory can be applied to distinguish components of the space of positive scalar metrics on a spin manifold in the presence of torsion in the fundamental group. Here we will survey some aspects of work from the past few years due to Piazza-Schick, Weinberger-Yu and Xie-Yu. Then we will present constructions using product formulas for secondary invariants which allow to obtain further examples of metrics of positive scalar curvature that can be distinguished in this way.
Date: Wed, 09.03.2016
Time: 13:15
Duration: 120 min
Location:Erwin Schrödinger International Institute, Boltzmanngasse 9, 1090 Wien, Boltzmann lecture hall

A Numerical Study of Axisymmetric Stationary Solutions to the Einstein-Vlasov System
Speaker:Ellery Ames (Chalmers, Gothenburg)
Abstract:im Rahmen des Literaturseminars: The Einstein-Vlasov system describes a large collection of collissionless particles interacting via the mean gravitational field, where gravity is modeled by general relativity. Here we present numerical solutions of these equations which are far-from spherically symmetric in the sense that the particle distributions take flattened and toroidal shapes, and the solutions have non-zero net angular momentum. In addition, certain families of solutions are found to contain ergoregions. This talk will include a discussion of the properties of the solutions obtained as well as the numerical methods.
Date: Thu, 10.03.2016
Time: 14:00
Duration: 60 min
Location:Arbeitsgruppe Gravitation, Währinger Strasse 17, Seminarraum A, 2. Stock, 1090 Wien
Contact:H. Rumpf

Two novel analytic solutions in relativistic hydrodynamics and magneto-hydrodynamics
Speaker:Di-Lun Yang (Theoretical Research Division, RIKEN, Japan)
Abstract:Albeit the success of numerical simulations of hydrodynamics for relativistic heavy ion collisions (HIC), the analytic solutions may provide an intuitive picture in physics, which could be further applied as testbeds for other theoretical models. On the other hand, the direct influence from magnetic fields generated in HIC on the hydrodynamic evolution is less studied both analytically and numerically. In this talk, I will first present a novel solution of relativistic hydrodynamics in 1+3 dimensions which depends on both the transverse coordinate and rapidity. At early times the flow expands dominantly longitudinally in a non-boost-invariant manner, and at late times it expands nearly spherically. Subsequently, I will introduce another new solution in magneto-hydrodynamics in the presence of an external magnetic field following the power-law decay in proper time and with inhomogeneities
Date: Thu, 10.03.2016
Time: 16:00
Duration: 60 min
Location:ITP seminar room, 10th floor (yellow tower), TU Wien, Wiedner Hauptstrasse 8-10, A 1040, Vienna