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چکیده
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A precise determination of the mass function is an important tool to verify cosmological predic- tions of the ΛCDM model and to infer more precisely the better model describing the evolution of the Universe. Galaxy clusters have been currently used to infer cosmological parameters, in particular the matter density parameter Ω m , the matter power spectrum normalization σ 8 and the equation of state parameter w de of the dark energy fluid. In this work, using data on massive galaxy clusters (M > 8 × 10 14 h −1 M ⊙ ) in the redshift range 0.05 < z < 0.83 we put constraints on the parameter α introduced within the formalism of the extended spherical collapse model to quantify deviations from sphericity due to shear and rotation.
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