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Main Colloquium |
Dr. Sebastian Bocquet
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LMU
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.