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Calendar of Physics Talks Vienna
| Scaling symmetry of Efimov states in a Fermi-Bose Li-Cs mixture |
| Speaker: | Cheng Chin (James Franck institute, Enrico Fermi institute, Department of Physics University of Chicago) |
| Abstract: | Discrete scaling symmetry, shown in Russian nesting dolls and in snow flakes, displays a unique form of beauty in art and in nature. In quantum world, discrete scaling symmetry is rare and implies a long-range correlations resulting in a log-periodic behavior in their observables.
Nuclear physicist Vitaly Efimov predicted in 1970 that a universal set of three-body bound states with the scaling symmetry emerges when the pair-wise interactions are resonantly enhanced. Efimov's conjecture has stimulated wide range of interest in nuclear, atomic and high-energy physics. Remarkably, Efimov states have been recently identified in many cold atom systems.
In this talk, we report the observation of three consecutive Efimov states in a Fermi-Bose 6Li-133Cs mixture near a broad interspecies Feshbach resonance. The states are revealed from the resonance structure in the three-body loss spectrum. The |
| Date: | Tue, 08.04.2014 |
| Time: | 10:30 |
| Location: | Seminarraum Atominstitut |
| Contact: | Jörg Schmiedmayer |
| Holography of the chiral magnetic effect and anisotropy in heavy ion collisions |
| Speaker: | Ingo Kirsch (DESY Hamburg) |
| Abstract: | The chiral magnetic effect (CME) is a highly discussed effect in heavy-ion collisions stating that, in the presence of a magnetic field B, an electric current is generated in the background of topologically nontrivial gluon fields. We present a holographic (AdS/CFT) description of the CME in terms of a fluid-gravity model which is dual to a strongly-coupled plasma with multiple anomalous U(1) currents. In the case of two U(1) charges, one axial and one vector, the CME formally appears as a first-order transport coefficient in the vector current. We will holographically compute this coefficient at strong coupling and compare it with the hydrodynamic result. Finally, we will discuss an anisotropic variant of the model and study a possible dependence of the CME on the elliptic flow coefficient v_2. |
| Date: | Tue, 08.04.2014 |
| Time: | 12:30 |
| Duration: | 60 min |
| Location: | Univ. of Vienna, Faculty of Physics (Boltzmanngasse 5, 5th floor, Schrödinger Lecture Hall / large seminar room) |
| Contact: | Peter Poier |
| Speaker: | Ioanis Malamos (IFIC/CSIC, Valencia) |
| Abstract: | im Rahmen des Teilchenphysikseminars |
| Date: | Tue, 08.04.2014 |
| Time: | 16:15 |
| Duration: | 60 min |
| Location: | Fakultät für Physik, Erwin-Schrödinger-Hörsaal, Boltzmanngasse 5, 5. Stock |
| Contact: | A. Hoang |
| Chiral Primaries in Strange Metals |
| Speaker: | Ingo Kirsch (DESY Hamburg) |
| Abstract: | It was suggested recently that the study of 1-dimensional QCD with fermions in the adjoint representation could lead to an interesting toy model for strange metals and their holographic formulation. In
the high density regime, the infrared physics of this theory is described by a constrained free fermion
theory with an emergent N = (2,2) superconformal symmetry. In order to narrow the choice of potential holographic duals, we initiate a systematic search for chiral primaries in this model. |
| Date: | Wed, 09.04.2014 |
| Time: | 16:00 |
| Duration: | 60 min |
| Location: | Inst. f. Theoret. Physik, TU Wien, SEM136, 10.OG, Wiedner Hauptstr. 8-10 |
| Contact: | Anton Rebhan |
| Generalized functions: an introduction |
| Speaker: | Eduard Nigsch |
| Abstract: | This talk is an introduction to the theories of generalized functions by
L. Schwartz (Distribution theory) on the one hand and J.-F. Colombeau
(Colombeau algebras) on the other hand. I will give sufficient motivation for the
formation of these theories and sketch their main properties and applications
in a non-technical manner. |
| Date: | Thu, 10.04.2014 |
| Time: | 10:30 |
| Duration: | 60 min |
| Location: | Faculty of Mathematics, University of Vienna, Besprechungszimmer 3 (3rd floor) |
| Contact: | M. Bauer, V. Branding, A. Burtscher, D. Fajman, F. Genoud, J. Joudioux |
| Overview on geometries of shape spaces, diffeomorphism groups and spaces of Riemannian metrics |
| Speaker: | Peter Michor (Vienna) |
| Abstract: | im Rahmen des Literaturseminars für Gravitationsphysik |
| Date: | Thu, 10.04.2014 |
| Time: | 14:15 |
| Duration: | 90 min |
| Location: | Arbeitsgruppe Gravitation, Währinger Strasse 17, Seminarraum A, 2. Stock, 1090 Wien |
| Contact: | P. Chrusciel, H. Rumpf |
| Aspects of the AGT conjecture |
| Speaker: | Gaston Giribet (University of Buenos Aires) |
| Date: | Thu, 10.04.2014 |
| Time: | 16:00 |
| Duration: | 60 min |
| Location: | SEM 136 (Freihaus, Wiedner Hauptstrasse 8-10), Institute for Theoretical Physics, Vienna University of Technology |
| Contact: | Daniel Grumiller |
| Holographic stress tensor from First law of entanglement entropy |
| Speaker: | Kallol Sen (Bangalore, Indian Inst. of Science) |
| Abstract: | Using the first law of entanglement, a simple method has recently been
proposed to compute the holographic stress tensor arising from a higher
derivative gravity dual. The stress tensor is proportional to a dimension dependent factor which depends on the higher derivative couplings. In this paper, we identify this proportionality constant with a B-type trace anomaly in even dimensions. This in turn relates to c_T, the coefficient appearing in the two point function of stress tensors.
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| Date: | Fri, 11.04.2014 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | SEM 136 (Freihaus, Wiedner Hauptstrasse 8-10), Institute for Theoretical Physics, Vienna University of Technology |
| Contact: | Daniel Grumiller and Johanna Knapp |
| Phase transition in random catalytic networks (Rudolf Hanel, Stuart A. Kauffman and Stefan Thurner) |
| Speaker: | Dominik Lin (Univ. Wien) |
| Abstract: | im Rahmen der gemeinsam veranstalteten Seminare "Komplexe Stochastische
Systeme" (Univ. Wien) und "Analyse Komplexer Systeme" (Med.Univ.Wien) |
| Date: | Fri, 11.04.2014 |
| Time: | 14:15 |
| Duration: | 90 min |
| Location: | Medizinische Univ. Wien, Informatikbibliothek, Bauteil 88, E03, Spitalgasse 23, 1090 Wien |
| Contact: | H. Hüffel und Stefan Thurner |
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