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Calendar of Physics Talks Vienna
| Beyond the Narrow-Width Limit for Off-Shell and Boosted Top Quark Decays (Vienna Theory Lunch Seminar) |
| Speaker: | Christoph Regner (Universität Wien) |
| Abstract: | This talk is part of the "Vienna Theory Lunch Seminar", a weekly seminar aimed at both graduate and advanced undergraduate students, jointly organized by the University of Vienna and TU Wien. The focus of the seminar is on recent theoretical research done by Master students, PhDs and PostDocs. Free lunch (pizza) will be provided at the seminar. For more information please visit our web page: https://lunch-seminar.univie.ac.at, where you can also subscribe to our mailing list. Please find the abstract on the web page as well. |
| Date: | Tue, 17.10.2023 |
| Time: | 12:30 |
| Duration: | 75 min |
| Location: | Boltzmanngasse 5, 5th floor, Schrödinger Lecture Hall |
| Contact: | Florian Lindenbauer |
| Black Hole Binary Dynamics from Classical and Quantum Gravitational Scattering |
| Speaker: | Prof. Thibault Damour (IHES - Institut des Hautes Etudes Scientifiques) |
| Abstract: | Gravitational wave signals from coalescing binary black holes are detected, and analyzed, by using large banks of template waveforms.
The construction of these templates makes an essential use of the analytical knowledge of the motion and radiation of gravitationally interacting binary systems.
A new angle of attack on gravitational dynamics consists of considering (classical or quantum) scattering states.
Modern amplitude techniques have recently giveninteresting novel results.
These results are reaching a levelwhere subtle conceptual issues arise (quantum-classical transition, radiative effects versus conservative dynamics, massless limit,...)
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| Date: | Tue, 17.10.2023 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | Fakultaet fuer Physik, Erwin Schroedinger-HS, Boltzmanngasse 5, 5. Stock |
| Contact: | S. Fredenhagen, A. Hoang, P. Chrusciel, D. Grumiller, H. Steinacker, T. Tran, A. Fiorucci |
| The status of naturalness I |
| Speaker: | Gian Giudice (CERN) |
| Abstract: | Naturalness arguments have been a powerful guiding principle for physicists as they try to construct new theories.
When applied to our current description of the microscopic world in terms of quantum field theory, naturalness leads
to the apparent paradox of the smallness of the electroweak scale and the cosmological constant, as compared to the Planck scale.
The hypotheses on which naturalness rests, the consequences of relaxing some of these hypotheses, and the current attempts to
develop new paradigms beyond naturalness will be discussed. |
| Date: | Tue, 17.10.2023 |
| Time: | 16:15 |
| Duration: | 60 min |
| Location: | Fakultaet fuer Physik, Erwin Schroedinger-HS, Boltzmanngasse 5, 5. Stock |
| Contact: | A. Hoang, M. Procura |
| Uniqueness of asymptotically flat vacuum instantons with a cyclic isometry group |
| Speaker: | Walter Simon (Univ. Vienna) |
| Abstract: | We consider 4-dimensional, Ricci-flat and asymptotically flat (AF) manifolds with metrics of either Lorentzian or Euclidean signature,
and with a 1-parameter group of isometries whose Killing tangent vectors have bounded length at infinity. If non-flat we call such Lorentzian solutions stationary AF black holes (SBHs) and the Euclidean ones S1-AF instantons (SGIs). The latter play a role in the path integral approach to Quantum Gravity which we review briefly. We then recall known examples of SBHs and SGIs. We continue with explaining the "nuts and bolts" classification of SGIs which is the Euclidean counterpart to stationary and static black hole horizons. We next review the Kerr uniqueness results, which read that analytic, connected SBH must be Kerr, and that SGIs with 2 nuts must be Euclidean Kerr. . . . |
| Date: | Wed, 18.10.2023 |
| Time: | 14:15 |
| Duration: | 60 min |
| Location: | Fakultaet fuer Physik, Isotopenphysik, VERA Seminar Raum, 1. Stock, Hoftrakt, Waehringer StraÃe 17 |
| Contact: | P. Chrusciel, D. Fajman |
| "Supersymmetry in the adjoint representation" aka "Unconventional Supersymmetry" |
| Speaker: | Pedro Alvarez (University of Antofagasta, Chile) |
| Abstract: | We study a general recipe to implement models for gravity, gauge
theories and matter using the adjoint representation of the
superconformal algebra. A striking feature of the model is that
fermion/boson matching of d.o.f. is not mandatory. Standard gauge
kinetic terms are included. The models are highly predictive, with
very few free parameters in the action. We will discuss general
properties of the theory and interesting gravitational solutions that
are found on it. |
| Date: | Thu, 19.10.2023 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | TU Wien, Freihaus, Sem.R. DA green 02 C - GEO |
| Contact: | Benjamin Koch, Iva Lovrekovic |
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