Fakultät für Physik und Astronomie

Physikalisches Kolloquium

Freitag, 18. Juli 2025 17:00 Uhr 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.

Teilchenkolloquium

Dark Matter and more with XENONnT and XLZD

Prof. Dr. Marc Schumann, Universität Freiburg

Astronomisches Kolloquium

Dienstag, 22. Juli 2025 16:30 Uhr Tracing out the darkness with cold gas: dynamically probing galaxy evolution and black holes

Timothy Davis, Cardiff University In this talk I will describe how mapping the dynamics of gas clouds in the centre of galaxies can help us to constrain a wide range of astrophysical problems. From the enigmatic relation between galaxies and their supermassive black holes, to the suppression of star-formation in dying galaxies, the dynamics of cold gas provides an ideal probe that can help us make progress. I will show how ~ten parsec resolution ALMA observations can be used to estimate the masses of supermassive black holes in galaxies across the Hubble sequence, both dynamically, and via the newly discovered ‘fundamental plane of black hole accretion in the millimetre”. I will show that the deep potential wells of massive galaxies change the small-scale structure of the ISM, suppressing star formation, and helping to keep bulge-dominated objects quenched. Finally I will show first results from the KILOGAS project, a new ALMA legacy survey for the resolved extragalactic ISM, that will map molecular gas and star formation across the Hubble sequence in nearly 500 nearby galaxies. To arrange a visit with the speaker during the visit, please contact their host: Dominika Wylezalek

Zentrum für Quantendynamik Kolloquium

Mittwoch, 23. Juli 2025 16:30 Uhr 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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