Cluster Counts Tension : a Sign of Primordial Non-Gaussianity ?

Z. Sakr (1) , D. Houguenague (2) , A. Blanchard (1)

1 IRAP - Institut de recherche en astrophysique et planétologie
2 AMU - Aix Marseille Université

Evolution and abundance of the large-scale structures we observe today, such asclusters of galaxies, is sensitive to the statistical properties of dark matterprimordial density fluctuations, which is assumed to follow a Gaussianprobability distribution function. Within this assumption , a significantdisagreement have been found between clusters counts made by Planck and theirprediction when calibrated by CMB angular power spectrum. The purpose of thiswork is to relax the Gaussianty assumption and test if Non-Gaussianity in darkmatter primordial density fluctuations, could alleviate the tension.

Domaines: Astrophysique [astro-ph]

Z. Sakr, D. Houguenague, A. Blanchard. Cluster Counts Tension : a Sign of Primordial Non-Gaussianity ?. 53rd Rencontres de Moriond on Cosmology, Mar 2018, La Thuile, Italy. pp.43-46. ⟨hal-03143609⟩