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We present the mass and X-ray temperature functions derived from a sample ofmore than 15,000 galaxy clusters of the MareNostrum Universe cosmological SPHsimulations. In these simulations, we follow structure formation in a cubicvolume of 500/h Mpc on a side assuming cosmological parameters consistent witheither the first or third year WMAP data and gaussian initial conditions. Wecompare our numerical predictions with the most recent observational estimatesof the cluster X-ray temperature functions and find that the low normalizationcosmological model inferred from the 3 year WMAP data results is barelycompatible with the present epoch X-ray cluster abundances. We can onlyreconcile the simulations with the observational data if we assume anormalization of the Mass-Temperature relation which is a factor of 2.5--3smaller than our non-radiative simulations predict. This deviation seems to betoo large to be accounted by the effects of star formation or cooling in theICM, not taken into account in these simulations.

Is WMAP3 normalization compatible with the X-Ray cluster abundance?