On Monday, December 16, 2024, at 12:00 c.t., the next date of our physics colloquium will take place this winter semester.
Dr. Sebastian Bocquet, Senior Research Scientist at the Ludwig-Maximilians-Universität München, will give a lecture entitled "NEW CONSTRAINTS ON COSMOLOGY FROM THE LARGE-SCALE STRUCTURE OF THE UNIVERSE".
With the latest generation of cosmological datasets, we are accessing an unprecedented wealth of information on the geometry and expansion of the universe and on the growth of cosmic structure. This has allowed for tight constraints on, e.g., the properties of neutrinos and dark energy, but also uncovered anomalies such as the Hubble tension and the S8 tension.
The abundance of galaxy clusters, the clustering of galaxies, and weak gravitational lensing are key probes of the cosmic large-scale structure. Over the past decade, tremendous progress was made in obtaining high-precision measurements, notably thanks to sensitive wide-field surveys of the cosmic microwave background (CMB) and of galaxies and gravitational lensing. Recently, the abundance of clusters selected in CMB data from the South Pole Telescope (SPT) - in combination with mass calibration based on weak-lensing data from the Dark Energy Survey (DES) and the Hubble Space Telescope (HST) - was shown to be compatible with and complementary to analyses of galaxy clustering and weak lensing (3x2pt using, e.g., DES data).
In my talk, I will review the SPT cluster cosmology and mass calibration program. I will focus on the latest SPT + DES + HST analysis and discuss the resulting cosmological constraints. I will then present new results from the multiprobe analysis of SPT clusters and DES 3x2pt. The precision of these new constraints highlights the benefits of multiwavelength multiprobe cosmology and our work paves the way for upcoming joint analyses of next-generation datasets.
Abstract of the presentation by Dr. Bocquet
The introduction will be made by Prof. Dr. Hendrik Hildebrandt.
The faculty cordially invites all interested parties. The event will take place in lecture hall HZO 20.
All dates of the Physics Colloquium can be found here.
Picture: © Sebastian Bocquet