Kinematic effects of the velocity fluctuations for dark halos population in LCDM model

TL;DR

This paper proposes a model incorporating velocity fluctuations in dark matter to reconcile the ΛCDM model with observed dark halo counts, explaining the local universe's mass deficit.

Contribution

It introduces a kinematic effects-based model within the Press-Schechter formalism to explain the dark halo population and mass deficit.

Findings

Model accounts for velocity fluctuations reducing dark halo excess

Quantitative explanation for local virialized mass deficit

Reconciles ΛCDM predictions with observations

Abstract

$\Lambda$CDM-model predicts an excess of dark halos compared to the observations. The excess is seen from the estimates of the virialized mass inside the Local Supercluster and its surroundings. It is shown that account for cosmological velocity fluctuations in the process of formation of the population of dark halos it is possible to eliminate this contradiction remaining within the framework of the $\Lambda$CDM cosmology. Based on the formalism of Press and Schechter, we suggest a model of formation of dark halo population which takes into account the kinematic effects in the dark matter. The model allows a quantitative explanation for the observable deficit of the virialized mass in the local Universe.