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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 |
| 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 |
| 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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