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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 |
| 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 |
| 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 |
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