Department for Physics and Astronomy

Events

Physikalisches Kolloquium

Friday, 18. July 2025 5:00 pm Perspectives on modern climate change from 67 years of direct atmospheric measurements

Prof. Ralph Keeling, GEOSCIENCES RESEARCH DIV., Scripps Institution of Oceanography, UC San Diego Perspectives on modern climate change from 67 years of direct atmospheric measurements Prof. Ralph Keeling GEOSCIENCES RESEARCH DIV., Scripps Institution of Oceanography, UC San Diego At the forefront of modern climate change research are time-series observations of atmospheric CO? and related species, such as atmospheric O?. These records now span many decades, providing unequivocal evidence of the profound influence of humans on the planet—particularly through the burning of fossil fuels. This talk will chart the history of this field, from the early measurements and scientific puzzles to the ongoing challenges of mitigating and adapting to climate change.

Particle Colloquium

The LHCb Phase-2b upgrade

Prof. Dr. Ulrich Uwer, Physikalisches Institut, Universität Heidelberg

Astronomy colloquium

Tuesday, 15. July 2025 4:30 pm From mass transfer to stripped stars

Pablo Marchant, Ghent University Binary interactions shape the evolution of the most massive stars, leading to significant deviations from the evolutionary pathways possible in single star evolution. These processes impact the universe at large scales and result in high energy events such as peculiar supernovae and gravitational wave sources. To understand these outcomes, it is important to assess binary evolution in early stages ranging from pre-interaction, roche-lobe overflow and post-interaction phases. I will discuss the current progress in our understanding of mass-transferring binaries, covering the impact of this process on the donor star (with the possible production of a stripped star), as well as the response of its companion. Of particular importance in recent years is the identification of bloated stripped stars caught immediately after interaction which provides a snapshot of the end-states of mass transfer, and I will discuss how their properties constrain orbital evolution and the efficiency of mass transfer. I will also emphasize that many of the uncertain processes in massive binary star evolution can also be assessed through the study of intermediate mass systems, for which the physics in early evolutionary phases does not differ significantly. To arrange a visit with the speaker during the visit, please contact their host: Jaime Villaseñor (MPIA)

Center for Quantum Dynamics Colloquium

Wednesday, 23. July 2025 4:30 pm Nonequilibrium Bose Gas in a Box

Prof. Zoran Hadzibabic , Department of Physics, University of Cambridge Nonequilibrium Bose Gas in a Box Prof. Zoran Hadzibabic Department of Physics, University of Cambridge Compared to the traditionally studied harmonically trapped ultracold atomic gases, the spatially uniform gases produced in optical box traps offer many new possibilities for studies of fundamental many-body physics and comparisons with theory. I will give an overview of our recent experiments on out-of-equilibrium box-trapped Bose gases, including the studies of turbulence [1] and of universal coarsening dynamics [2,3]. [1] L. H. Dogra et al., Nature 620, 521 (2023) [2] M. Gazo et al., arXiv:2312.09248 [3] G. Martirosyan et. al., arXiv:2410.08204

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