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Calendar of Physics Talks Vienna
| Heavy quark diffusion in the hot QCD matter |
| Speaker: | Santosh K. Das (Indian Inst. Tech. Goa) |
| Abstract: | The heavy quarks, mainly charm and bottom, are considered as a unique probe of the quark-gluon plasma (QGP) produced in high-energy heavy-ion collisions. The heavy quark diffusion in the QGP phase will be discussed. I shall discuss the difficulties of the current theoretical approach to provide a self-consistent description of the experimental data and the recent developments. Heavy quark diffusion in the pre-equilibrium phase will be discussed, and its consequence on experimental observables will be highlighted. Finally, I shall present our recent results on heavy quark diffusion in a hot QCD medium with a time-correlated noise and its impact on experimental observables. |
| Date: | Tue, 23.05.2023 |
| Time: | 10:00 |
| Duration: | 60 min |
| Location: | TU Wien, Freihaus, Sem.r. DC red, 7th floor; Zoom: Meeting ID: 617 7161 9089 |
| Contact: | Kirill Boguslavski |
| Kaluza-Klein Spectrometry for String Theory Compactifications |
| Speaker: | Emanuel Malek (Humboldt Univ. Berlin) |
| Abstract: | I will present a powerful new method that for the first time allows us to compute the Kaluza-Klein spectrum of a large class of string theory compactifications,including those arising in maximal gauged supergravities and beyond.This includes geometries with little to no remaining(super-)symmetries,completely inaccessible by previous methods. I will show how these insights can be used to holographically compute the anomalous dimensions of protected and unprotected operators in strongly-coupled CFTs, as well as to study global properties of their conformal manifolds. I will also show how the method can be used to determine the perturbative stability of non-supersymmetric AdS vacua.
We will see the importance of higher Kaluza-Klein modes to the physics of string compactifications, e.g.in realising the compactness of moduli spaces, and in destabilising vacua that appear to stable in ... |
| Date: | Tue, 23.05.2023 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | TU Sem.R. DA gruen 05 (Freihaus, TU Wien, Wiedner Hauptstrasse 8) |
| Contact: | S. Fredenhagen, D. Grumiller, E. Battista, R. Ruzziconi |
| Mechanoresponsive Proteins from molecular mechanisms towards applications in biology and materials science |
| Speaker: | Kerstin G. Blank (Johannes Kepler University, Institute of Experimental Physics, Department of Biomolecular & Selforganizing Matter, Linz/OÃ) |
| Abstract: | Proteins are essential building blocks of biogenic materials. In addition to purely protein-based materials, a wide range of different composite materials are formed in Nature, where proteins mediate specific interactions with other biopolymers or mineral surfaces. Using single-molecule force spectroscopy, our key goal is to establish the fundamental sequence-structure-MECHANICS relationships of such interactions and to utilize these for the bottom-up assembly of mechanoresponsive bioinspired materials. In this talk, two examples of protein building blocks will be highlighted. The first example introduces coiled coils, which are highly abundant structural motifs in mammalian tissues. Using synthetic coiled coils, we have unravelled key factors that determine the stability of these structures against shear forces. We then utilized this knowledge to establish a library of mechanically cali |
| Date: | Tue, 23.05.2023 |
| 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. Dr. Markus Valtiner |
| Floccinaucinihilipilification |
| Speaker: | Ben Allanach (CERN, Schweiz, DAMTP, University of Cambridge) |
| Abstract: | By throwing away theories beyond the Standard Model that are not of interest, wemay arrive at some that are.
We use anomaly cancellation to constrain extensions by an additional U(1) gauge group factor.
Once such an additional gauge factor is spontaneously broken, the resulting Z' gauge boson has potential phenomenological uses,
for example to ameliorate tensions between measurements of certain flavour-changing B decays and their Standard Model predictions.
We compareand contrast one such Z' against a simple bottom-up leptoquark model, to look for statistical preference or lack thereof.
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| Date: | Tue, 23.05.2023 |
| Time: | 16:15 |
| Duration: | 60 min |
| Location: | Fakultaet fuer Physik, Erwin Schroedinger-HS, Boltzmanngasse 5, 5. Stock |
| Contact: | A. Hoang, M. Procura, T. Corbett |
| Squeezing oscillations in multimode Bosonic Josephson Junction |
| Speaker: | Tiantian Zhang (TU Wien, Atominstitut) |
| Abstract: | Quantum simulators built from ultracold atoms promise to study quantum phenomena in interacting many-body systems. However, it remains a challenge to experimentally prepare strongly correlated continuous systems such that the properties are dominated by quantum fluctuations. Here, we show how to enhance the quantum correlations in a multimode bosonic Josephson junction; our approach is based on the ability to track the dynamics of quantum properties. After creating a bosonic Josephson junction at the stable fixed point of the classical phase space, we observe squeezing oscillations in the two conjugate variables. We show that the squeezing oscillation frequency can be tuned by more than one order of magnitude and we are able to achieve a spin squeezing close to 10 dB by utilizing this oscillatory dynamics. The impact of improved spin squeezing is directly revealed by detecting enhanced s |
| Date: | Wed, 24.05.2023 |
| Time: | 16:15 |
| Duration: | 45 min |
| Location: | Helmut Rauch Hörsaal ATI |
| Contact: | Maximilian Prüfer |
| A dynamical inflaton coupled to strongly interacting matter |
| Speaker: | Christian Ecker (Goethe University) |
| Abstract: | Abstract: According to the inflationary theory of cosmology, most
elementary particles in the current universe were
created during a period of reheating after inflation.
In this talk I will show how to self-consistently couple the
Einstein-inflaton equations to a strongly coupled quantum field theory
(QFT) that is described by holography.
I will then use a specific example to demonstrate that this setup leads
to an inflating universe, a reheating phase and finally a universe
dominated by the QFT in thermal equilibrium.
This talk is based on arXiv:2302.06618. |
| Date: | Thu, 25.05.2023 |
| Time: | 15:00 |
| Duration: | 60 min |
| Location: | TU Wien, Freihaus, Seminar room 10th floor |
| Contact: | Daniel Grumiller, Iva Lovrekovic |
| Twisted Self-Similarity and the Einstein Vacuum Equations |
| Speaker: | Yakov Shlapentokh-Rothman (University of Toronto) |
| Abstract: | We will start with a brief discussion about the role of self-similarity for the Einstein vacuum equations and then will introduce our new class of twisted self-similar solutions.
The key defining feature of these new self-similar solutions is that while the homothetic vector field is tangent to the past light cone of the origin of dilation symmetry,
it does not coincide with the null generators of this hypersurface and instead ``twists'' around the light cone.
We will explain how to compute formal power series for these twisted self-similar solutions and discuss some applications.
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| Date: | Thu, 25.05.2023 |
| Time: | 15:30 |
| Duration: | 60 min |
| Location: | by zoom: https://univienna.zoom.us/j/6540036841?pwd=SytyVkZJZzNyRG9lMm13ejlHeHRRUT09 Meeting ID: 654 003 6841 Passcode: Gs4brS |
| Contact: | P. Chrusciel, D. Fajman |
| Sensing with undetected photons and 3 kinds of photon entanglement |
| Speaker: | Sven Ramelow (Humboldt University of Berlin) |
| Abstract: | A principle limitation for the real-world adaptation of mid-IR sensing technologies is rooted in mid-IR detectors, as well as broadband mid-IR sources being often prohibitively expensive, technically demanding and suffering from poor performance. This has lead to different approaches of side-stepping these by moving the detection wavelength to the visible regime, where one can enjoy the comparable maturity of CCD and CMOS technology driven by the life sciences, mobile phone and automotive industry. A convenient and technologically simple means for making detectors and sources in the mid-IR obsolete are nonlinear interferometers based on entangled, widely non-degenerate photon pairs. They enable compact and cost-effective sensing in the mid-IR, and the presentation will give an overview on the experimental results on microscopy, spectroscopy and OCT and highlight their potential on real-w |
| Date: | Fri, 26.05.2023 |
| Time: | 10:00 |
| Duration: | 45 min |
| Location: | ATI Hörsaal/https://tuwien.zoom.us/j/93672218922?pwd=dEZNQ2liVzRNNURvNmVWVE5KUWRiQT09 |
| Contact: | Philipp Haslinger |
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