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Calendar of Physics Talks Vienna
| Dual and extended asymptotic charges |
| Speaker: | Hadi Godazgar (MPI, Potsdam) |
| Abstract: | im Rahmen des Seminars für Mathematische Physik (Joint TU/UV Theory Seminar): I will review recent progress in understanding the relation between charges in
asymptotically flat spacetimes. This work has lead to the realisation that there
is an infinite number of dual BMS charges that complement the ones already in
the literature. I will discuss the construction of these charges and their implication.
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| Date: | Tue, 26.11.2019 |
| Time: | 13:45 |
| Duration: | 60 min |
| Location: | Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock |
| Contact: | S. Fredenhagen, D. Grumiller |
| Speaker: | Andreas Dahlin (Chalmers University of Technology, Dept. of Chemistry & Chemical Engineering, Div. of Applied Chemistry, Gothenburg/Sweden) |
| Abstract: | There is a steady need for new methods to detect, separate and
analyze biomolecules using in vitro or “bottom-up” approaches. In
this project we combine plasmonic nanopores and polymer brushes
with the long-term aim to develop new bioanalytical devices.
Meanwhile we also address fundamental questions within the fields
of macromolecules and supramolecular chemistry. Examples are
interactions (or just repulsion) between different proteins and
synthetic polymer chains. The combination of polymer brushes and
nanopores offers unique possibilities to study brushes as barriers or
selective filters. For one thing, interactions with the surface can be
ignored as they do not influence the molecular transport through
the brush. To complement the work with nanopores we also
perform extensive analysis of the polymer brushes on planar
surfaces using various tools, in particular surface plasmon
resonan |
| Date: | Tue, 26.11.2019 |
| 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. Markus Valtiner |
| Higgs boson production in weak boson fusion: non-factorizable QCD corrections |
| Speaker: | Kirill Melnikov (KIT, Karlsruhe) |
| Abstract: | I will review theoretical predictions for Higgs boson production in weak boson fusion. I will also
discuss the so-called non-factorizable corrections that arise at next-to-next-to-leading order in perturbative QCD.
These corrections can be computed in the so-called eikonal approximation,
retaining all the terms that are not suppressed by the ratio of the transverse momenta of the tagging jets
to the total center-of-mass energy. In certain kinematic distributions the non-factorizable corrections can be
quite comparable to their factorizable counter-parts. |
| Date: | Tue, 26.11.2019 |
| Time: | 16:15 |
| Duration: | 60 min |
| Location: | Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock |
| Contact: | A. Hoang, S. Plätzer |
| Connecting the phase space with electron transport in ballistic nanodevices |
| Speaker: | George Datseris (MPI Göttingen) |
| Abstract: | In ballistic nanodevices it is often the case that classical mechanics are a fitting, and sometimes even adequate, theoretical framework to describe how electrons are transported through the device. A central concept of classical mechanics is the phase space, i.e. the coupled space of momenta and coordinates. In this talk I will present 3 projects done in collaboration with Ragnar Fleischmann, whose common theme is looking at electron transport through the lens of the phase space. We will first look at how separating the phase space into regular and chaotic components can help us understand the magneto-resistance of an antidot superlattice, a nanodevice well approximated by billiards. Then, in graphene-based nanodevices we will argue that projecting quantum transport simulations into the phase space using the Husimi function is a process that can give insight into many different … |
| Date: | Wed, 27.11.2019 |
| 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 |
| Spherically symmetric steady states of Newtonian self-gravitating elastic matter |
| Speaker: | Artur Alho (Univ. de Lisboa, Portugal) |
| Abstract: | In this talk I will introduce a new definition of spherically symmetric elastic body in Newtonian gravity. Using this new definition it is possible to introduce Milne-type homology invariant variables which transform the field equations into an autonomous system of nonlinear differential equations. By employing dynamical systems methods I will finally discuss the existence of static balls for a wide variety of constitutive equations, including Seth, Signorini, Saint Venant-Kirchhoff, Hadamard, and John’s harmonic materials. |
| Date: | Thu, 28.11.2019 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | Arbeitsgruppe Gravitation, Währinger Strasse 17, Raum 218, 2. Stock, 1090 Wien |
| Contact: | P.T. Chrusciel, D. Fajman |
| Probing the EVH limit of supersymmetric AdS black holes |
| Speaker: | Yang Lei (Wits/NBI) |
| Abstract: | Extremal black holes are well known to contain an AdS2 factor in their near-horizon geometries. If the extremal limit is taken in conjunction with a specific vanishing horizon limit, the so-called Extremal Vanishing Horizon (EVH) limit, the AdS2 factor lifts to a locally AdS3 factor. We consider the (near-)EVH limit of 1/16 BPS asymptotically AdS5 black hole, in which the near-horizon geometry instead contains AdS3/BTZ factor. We employ recent results on the large N limit of the superconformal index of the dual CFT4 to understand the emergence of a CFT2 in the IR of the CFT4, which is the field theory dual to the emergence of the locally AdS3 factor in the near-horizon geometry. In particular, we show that the inverse Laplace transform of the superconformal index, yielding the black hole entropy, becomes equivalent to the derivation of a Cardy formula for the dual CFT2. |
| Date: | Thu, 28.11.2019 |
| Time: | 16:00 |
| Duration: | 60 min |
| Location: | TU Wien, Wiedner Hauptstraße 10, Yellow Area, Seminar Room |
| Contact: | D. Grumiller, C. Zwikel |
| The Riemannian Penrose inequality for asymptotically flat manifolds with a non-compact boundary |
| Speaker: | Thomas Körber (Albert-Ludwigs-Universität Freiburg) |
| Abstract: | as part of the Joint General Relativity and Geometric Analysis:
The Riemannian Penrose inequality is a fundamental result in mathematical general relativity and provides an estimate for the area of an outermost minimal surface in an asymptotically flat three-manifold solely in terms of the global mass. It was originally proven by Huisken and Illmanen using a weak version of the inverse mean curvature flow which has the crucial property of evolving the so-called Hawking mass in a non-decreasing way. In this talk, I will present a recent result which shows that a suitable version of the Penrose inequality continues to hold if the ambient manifold has a non-compact boundary. The main ingredient in the proof is a free boundary version of the weak inverse mean curvature flow which is obtained as the limit of a new approximation scheme accommodating for the presence of the non-compact boundary |
| Date: | Fri, 29.11.2019 |
| Time: | 11:00 |
| Duration: | 60 min |
| Location: | Fakultät für Mathematik, Oskar-Morgenstern-Platz 1, Besprechungszimmer, 9. Stock |
| Contact: | P.T. Chrusciel, M. Eichmair |
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