Cosmological cluster tension
Résumé
The abundance of clusters is a classical cosmological probe sensitive to boththe geometrical aspects and the growth rate of structures. The abundance ofclusters of galaxies measured by Planck has been found to be in tension with theprediction of the ΛCDM models normalized to Planck CMB fluctuations powerspectra. The same tension appears with X-ray cluster local abundance. Massiveneutrinos and modified gravity are two possible solutions to fix this tension.Alternatively, others options include a bias in the selection procedure or inthe mass calibration of clusters. We present a study, based on our recent work 4, updating the present situation on this topic and discuss the likelihood of thevarious options.