• Starting date: 2022/07/25
  • End: 2022/07/29

  • LOCATION: Haus Sexten - Via Dolomiti 45, 39030, Sexten


    With an unprecedented amount of high-quality data, this is an exciting time for the field of Cosmology. There is emerging evidence of a tension in the measurement of the Hubble constant H0 (measuring the expansion history) between low redshift probes and predictions from the CMB. In parallel, there are a number of other inconsistencies between other probes which have the potential to fundamentally change our understanding of the universe. One of the most relevant ones is the persistent difference in the amplitude of the matter perturbations today, σ8, as measured from the CMB observations of the Planck satellite, in relation to those measured at low redshifts (galaxy cluster counts and weak lensing observations). Furthermore, these inconsistencies imply that these experiments cannot in principle be combined to characterize dark energy.

    While astrophysical uncertainties might affect the estimates of the low redshift probes, the exciting possibility that this discrepancy is caused by genuine cosmological effects and new physics is still wide open.

    The aim of this workshop will be to discuss the latest experimental advancements and theoretical implications of these issues and will bring together some of the main scientists working on these problems.The workshop will explore the consistency of different probes of the growth of the structure in the universe, testing the agreement between CMB, weak lensing, clustering, cluster counts, and redshift space distortions and discussing the possible theoretical implications. The workshop will be the occasion to better understand current inconsistencies, discuss new results that have been or will be published in the coming year by experiments such as ACT, SPT, DES, HSC, KiDS, DESI and others and prepare for upcoming surveys such as Euclid, Roman, and Rubin.


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    Fabio Finelli (Osservatorio di Astrofisica e Scienza dello Spazio di Bologna,INAF, Italy),
    Silvia Galli (Institut d’Astrophysique de Paris),
    Hendrik Hildebrandt (Ruhr University Bochum, Germany),
    Bhuvnesh Jain (Center for Particle Cosmology, University of Pennsylvania),
    Alexie Leauthaud (University of California Santa Cruz, USA),
    Julien Lesgourgues (Institute for Particle Physics and Cosmology, RWTH Aachen University, Germany)