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Calendar of Physics Talks Vienna
| Dark Matter Signal from Atomic to Galactic Scales (Vienna Theory Lunch Seminar) |
| Speaker: | Garance Lankester and Stefan Daniel Nellen Mondragon (University of Vienna, ÃAW ) |
| Abstract: | Despite extensive observational evidence, the true nature of Dark Matter (DM) remains one of the most persistent mysteries in modern physics. A key challenge lies in DM's weak interaction with ordinary matter, which results in subtle and difficult-to-detect signals. This talk will provide a comprehensive overview of the current understanding of DM, from its historical foundations to the latest advancements in both direct and indirect detection methods. At the galactic scale, we will focus on the implications of Self-Interacting Dark Matter (SIDM) in addressing the small-scale structure problem. Additionally, we will explore how phenomena intrinsic to matter, such as the Migdal effect, can significantly enhance the sensitivity of direct detection experiments, potentially unlocking new avenues for observing DM. [[part of https://lunch-seminar.univie.ac.at]] |
| Date: | Tue, 10.12.2024 |
| Time: | 12:15 |
| Duration: | 75 min |
| Location: | University of Vienna: Boltzmanngasse 5, 5th floor, Schrödinger Lecture Hall |
| Contact: | Florian Lindenbauer |
| Local Superconformal Algebras |
| Speaker: | Ingmar Saberi (LMU Munich) |
| Abstract: | I will describe some recent work that gives a geometric approach to constructing the conformal supergravity multiplet, in any dimension and with any amount of supersymmetry. The method produces the full gauge algebra, and may or may not produce an on-shell theory in the BV formalism, depending on the example in question. The approach is via the deformation theory of superconformal structures.
I will try and give a friendly, conceptual overview of this perspective on superspace geometry, which draws on an analogy between superconformal structures and almost complex structures. |
| Date: | Tue, 10.12.2024 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | Erwin-Schroedinger-Hoersaal, 1090 Vienna, Boltzmanngasse 5, 5th floor |
| Contact: | S. Fredenhagen, M. Sperling |
| Density and surface tension of supercooled water and aqueous solution |
| Speaker: | Jan Hruby (Czech Academy of Science, Prague/CZ) |
| Abstract: | For a limited time, water can exist in the liquid phase at temperatures below the equilibrium freezing point as a metastable supercooled liquid. This phenomenon is common in the clouds and mist. Water exhibits numerous anomalies, the best known is the density maximum at 4°C and a negative coefficient of thermal expansion below this temperature. In the supercooled region, the anomalies get stronger. Anomalous thermodynamic properties of supercooled water can be explained by a hypothesis of two liquid phases and a liquid-liquid critical point, which is supported by indirect evidence. |
| Date: | Tue, 10.12.2024 |
| Time: | 16:00 |
| Location: | TU Wien, Institut für Angewandte Physik, E134 1040 Wien, Wiedner HauptstraÃe 8-10 Yellow Tower âBâ, 5th floor, SEM.R. DB gelb 05 B |
| Contact: | Univ.Prof. G. Parkinson |
| QCD Scattering in the Regge Limit |
| Speaker: | Einan Gardi (University of Edinburgh) |
| Abstract: | Fixed-order computations of QCD amplitudes in general kinematics are limited to either one, two or three loops, depending on the number of particles produced. This strongly motivates our theoretical research programme aimed at understanding the behaviour of quark and gluon scattering amplitudes in special kinematic limits, in which new factorization and exponentiation properties arise. A particularly interesting limit is the Regge limit, where major simplifications take place. A remarkable property of this limit is the exponentiation of energy logarithms, a phenomenon known as gluon Reggeization, leading to power-like dependence on the energy. This phenomenon can be investigated by establishing rapidity evolution equations. The dynamics is markedly more complex in full QCD, where colour off-diagonal evolution, generated by multi-Reggeon interactions, gives rise to Regge cuts, as compare |
| Date: | Tue, 10.12.2024 |
| Time: | 16:15 |
| Duration: | 60 min |
| Location: | Erwin-Schroedinger-HS, Boltzmanngasse 5, 1090 Wien, 5.Stock |
| Contact: | A. Hoang, M. Procura |
| Testing CPT symmetry with multi-strange baryons mass precision measurements using ALICE |
| Speaker: | Romain Schotter (Stefan Meyer Institute) |
| Abstract: | In any relativistic quantum field theory such as Quantum Chromodynamics or Electroweak theory, the interactions are invariant under the combined operation of Charge conjugation (C), Parity transformation (P) and Time reversal (T). One of the consequences of this (CPT) symmetry is that particles and their corresponding antiparticles must have exactly same mass. While the mass difference between proton and antiproton has been measured to a very high precision, the extension to (multi-)strange baryons domain still lacks precise measurements due to statistical limitations.
The ALICE detector is optimized to reconstruct decays of multi-strange baryons...
[for full abstract please visit: https://indico.cern.ch/event/1482316/]
chaired by: Claude Amsler and David Chinellato |
| Date: | Wed, 11.12.2024 |
| Time: | 15:00 |
| Duration: | 60 min |
| Location: | PSK (Georg-Coch-Platz 2, 1010 Wien) 3.OG, Besprechungsraum #1 |
| Contact: | Eberhard Widmann, Martin Simon |
| Comparing fermionic superfluids in two and three dimensions |
| Speaker: | Henning Moritz (University of Hamburg) |
| Abstract: | Understanding the origins of unconventional superconductivity has been a major focus of condensed matter physics and experiments have found the highest critical temperatures in layered 2D materials. However, to what extent the remarkable stability is affected by their reduced dimensionality is still an open question. Here, I will discuss influence of dimensionality on the stability of strongly interacting fermionic superfluids.
I will introduce fermionic superfluidity in ultracold atoms, where Cooper pairs forms. Their pair size can be continuously tuned from the Bardeen-Cooper-Schrieffer (BCS) regime of loosely bound pairs to the BEC regime of very tightly bound pairs [1]. I will introduce the critical velocity vc and the pairing gap Î and review milestone experiments performed on superfluid 3D Fermi gases [2]. After explaining how to determine vc and Î using Bragg spectroscopy I will d |
| Date: | Fri, 13.12.2024 |
| Time: | 10:00 |
| Duration: | 45 min |
| Location: | Helmut Rauch Lecture Hall |
| Contact: | Julian Leonard |
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