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Calendar of Physics Talks Vienna
| Foundational Properties of Gravity: Theoretical Frameworks and Observational Tests |
| Speaker: | Lavinia Heisenberg (Heidelberg University) |
| Abstract: | This talk examines the foundational properties of gravity through a range of theoretical perspectives, including geometrical, field-theoretical, quantum, and balance-law approaches. These frameworks are systematically compared and analyzed to identify their core assumptions and predictions. Observational evidence from cosmology, astrophysics, gravitational-wave detections, and particle physics experiments is then employed to rigorously test and constrain these properties, providing a unified assessment of gravity across scales. |
| Date: | Tue, 23.06.2026 |
| Time: | 14:00 |
| Duration: | 60 min |
| Location: | Erwin-Schroedinger-HS, Boltzmanngasse 5, 1090 Wien, 5.Stock |
| Contact: | S. Fredenhagen, M. Sperling |
| Speaker: | Pamela Morales Fernández (Max Planck Institute for Chemical Physics of Solids, Dresden/Germany) |
| Abstract: | Three-dimensional (3D) magnetic nanostructures promise exciting opportunities beyond the physics of planar systems, with prospects for new topological textures [1], curvilinear effects [2], non-reciprocal dynamics [3] and ultrafast texture motion. Yet, investigating dynamics in complex 3D nanogeometries has remained challenging due to limitations in fabrication and characterization. Here, we combine direct 3D nanoprinting [4], lab-based magnetic imaging, and time-resolved X-ray microscopy [5] to experimentally uncover the dynamics in cobalt nano double helices [6]. First, we observe resonant dynamics of coupled domain walls in real space and time, while micromagnetic simulations reveal the origin of the observed resonances and predict additional higher-frequency modes tunable though geometry. By engineering the double helix geometry, the magnetostatic coupling strength and resonant frequ |
| Date: | Tue, 23.06.2026 |
| Time: | 16:00 |
| Location: | TU Wien, Institut für Angewandte Physik, E134 1040 Wien, Wiedner Hauptstraße 8-10 Yellow Tower „B“, 5th floor, SEM.R. DB gelb 05 B |
| Contact: | Prof. Amalio Fernadez-Pacheco |
| When can a Collision Shake an Electron off an Atom? The Migdal Effect and Adiabatic Response |
| Speaker: | Stefan Nellen (University of Vienna) |
| Abstract: | The Migdal effect, the prompt ionization induced by a nuclear recoil, has become an important channel in direct dark matter searches, enabling sensitivity to recoils that would otherwise fall below nuclear-recoil thresholds. Recently, the first detection of the Migdal effect from neutron-nucleus scattering was announced in a gaseous target. Over the past decade, the theory of the Migdal effect has also been developed and extended beyond atoms. A significant issue in standard calculations of the Migdal ionization rate is that they rely on the so-called impulse approximation: the assumption that the projectile scatters off the nucleus instantaneously. However, for a sufficiently slow interaction, one would expect the electrons to respond adiabatically and ionization to be suppressed; the electron cloud remains in its ground state and moves together with the slowly recoiling nucleus. In thi |
| Date: | Tue, 23.06.2026 |
| Time: | 16:15 |
| Duration: | 60 min |
| Location: | Erwin-Schroedinger-HS, Boltzmanngasse 5, 1090 Wien, 5.Stock |
| Contact: | A. Hoang, M. Procura, J. Pradler |
| Far-from-equilibrium emergence of order in homogeneous Bose gases |
| Speaker: | Zoran Hadzibabic (Cambridge ) |
| Abstract: | Relaxation and condensation of an isolated low-energy Bose gas provide an ideal setting for the study of universal features of far-from-equilibrium many-body dynamics and the emergence of long-range order. I will give an overview of our recent experiments on the emergence of order in homogeneous Bose gases, produced in optical box traps [1-4]. Using complementary experimental probes, we have developed a comprehensive picture that connects different theoretical points of view, including the modern theory of nonthermal fixed points and the traditional theories of turbulence. |
| Date: | Fri, 26.06.2026 |
| Time: | 13:00 |
| Duration: | 45 min |
| Location: | Helmut Rauch Hörsaal ATI |
| Contact: | Jörg Schmiedmayer |
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