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Calendar of Physics Talks Vienna
| Quantum Spacetimes and Gravity in IKKT matrix model |
| Speaker: | Alessandro MANTA (University of Vienna) |
| Abstract: | IKKT is a non-perturbatively defined model of quantum gravity, which studies quantum dynamics of quantized (fuzzy) spacetimes, represented as matrix configurations.
I will explain how the weakly coupled regime of a 4d spacetime with fuzzy extra dimensions contains Einstein-Hilbert gravity at one-loop. In particular we can estimate the Newton constant from the geometry of the extra dimensions.
Furthermore, for a specific class of solutions of classical IKKT (and mass deformations), Covariant Cosmological Quantum Spacetimes, we study different mechanisms for dynamical stabilization of the extra dimensions. |
| Date: | Tue, 03.06.2025 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | Erwin-Schroedinger Lecture Hall, 1090 Vienna, Boltzmanngasse 5, 5th floor |
| Contact: | S. Fredenhagen, M. Sperling |
| Dispelling the sqrt(L) myth for the High-Luminosity LHC |
| Speaker: | Roman Kogler (DESY) |
| Abstract: | Extrapolations of sensitivity to new interactions and standard model parameters are crucial in planning future upgrade programmes and colliders. Such studies were performed in 2018-2019 to estimate the physics potential of the LHC's high-luminosity phase (HL-LHC) and are currently underway for future colliders. Statistical considerations based on established analysis strategies typically give rise to a sensitivity scaling with the square root of the luminosity, sqrt(L). This suggests only a mild sensitivity improvement for the HL-LHC compared to the presently available LHC data. In this talk, I will provide clear evidence that the sqrt(L) scaling for the HL-LHC is overly conservative and unrealistic, using representative analyses in top quark, Higgs boson and electroweak gauge boson phenomenology, and searches for new physics. |
| Date: | Tue, 03.06.2025 |
| Time: | 16:00 |
| Duration: | 60 min |
| Location: | Besprechungsraum 3A.1/2 in Postsparkasse, Georg-Coch-Platz 2, 1010 Wien |
| Contact: | Mukul Sholapurkar (HEPHY), David Dobrigkeit Chinellato (SMI) |
| Big bang dynamics of cosmological fluid models |
| Speaker: | Florian BEYER (University of Otago) |
| Abstract: | This talk investigates the dynamics of cosmological Einstein-scalar field-fluid solutions near the Big Bang singularity, moving beyond assumptions of spatial homogeneity and isotropy. Over the past decade, significant progress has been made in understanding these dynamics through advances in the theory of nonlinear partial differential equations, though many questions remain unresolved.
I will provide an overview of these developments focusing on recent results from my collaboration with Todd Oliynyk. |
| Date: | Wed, 04.06.2025 |
| Time: | 14:15 |
| Duration: | 60 min |
| Location: | Seminar Room A, Waehringer Str. 17, 1090 Vienna, 2nd floor |
| Contact: | D. Fajman |
| Enhancing Light-Matter Interactions In Integrated Platforms |
| Speaker: | Malaika Waheed (TU Wien Atominstitut) |
| Abstract: | The development of quantum technologies, such as quantum sensing, secure quantum communication, and quantum computing, depends critically on efficient light-matter interactions, particularly for the emission and detection of single photons. However, scalability, efficiency, and integration with semiconductor platforms are real challenges at present. This research explores single photon emitters such as hexagonal boron nitride (hBN), a two-dimensional material known for its room-temprature stability, exceptional optical properties and compatibility with integrated platforms. In order to detect the emitted single photons, there will be implementation of the single-photon avalanche diode detector using the complementary metal-oxide semiconductor process. Hence, this scalable, integrated system would contribute to practical on-chip integrated technologies. |
| Date: | Wed, 04.06.2025 |
| Time: | 16:15 |
| Duration: | 45 min |
| Location: | Helmut Rauch Hörsaal ATI |
| Contact: | Maximilian Prüfer |
| High-precision spectroscopic measurements and low-energy tests of fundamental physics using frequency metrology methods in the mid-IR |
| Speaker: | Benoit Darquie (Univ. Paris Nord) |
| Abstract: | There is an increasing demand for precise molecular spectroscopy, in particular in the mid-infrared fingerprint window, whether it be for modelling our atmosphere, interpreting astrophysical spectra or testing fundamental physics. I will present our efforts towards building new-generation mid-infrared spectrometers specifically designed for precision vibrational spectroscopy of complex polyatomic molecules in the gas phase. This includes amongst other things producing gases of polyatomic species cooled to a few kelvins in cryogenic buffer-gas cells, developing frequency stabilised mid-IR lasers calibrated to some of the worldâs best frequency standards and explore the opportunities offered by cutting-edge mid-IR photonics technologies. These developments are at the forefront of cold molecule research and frequency metrology and have allowed us to measure absolute frequencies of a variety |
| Date: | Fri, 06.06.2025 |
| Time: | 10:00 |
| Duration: | 45 min |
| Location: | Helmut Rauch Hörsaal ATI |
| Contact: | Tim Langen |
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