Halo collapse: virialization by shear and rotation in dynamical dark-energy models. Effects on weak-lensing peaks

Abstract

The evolution of the virial overdensity ${\Delta }_{\mathrm{vir}}$ for $\Lambda$CDM and seven dynamical dark-energy models is investigated in the extended spherical collapse model (SCM). Here the virialization process is naturally achieved by introducing shear and rotation instead of using the virial theorem. We generalise two approaches proposed in the literature and show that, regardless of the dark-energy model, the new virialization term can be calibrated on the peculiar velocity of the shell as measured from Einstein-de Sitter simulations. The two virialization recipes qualitatively reproduce the features of the ordinary SCM, i.e., a constant ${\Delta }_{\mathrm{vir}}$ for the EdS model and time-variation for dark-energy models, but without any mass dependence. Depending on the actual description of virialization and on the dark-energy model, the value of ${\Delta }_{\mathrm{vir}}$ varies between 10 and 40 percent. We use the new recipes to predict the surface-mass-density profile of dark matter haloes and the number of convergence density peaks for LSST- and Euclid-like weak lensing surveys.

27 pages, 9 figures, 3 tables. It matches the published version on JCAP. New sections added on stable clustering and on the convergence peaks. The numerical code is available upon request to the corresponding author

References in corpus (16)

• Imperfect Dark Energy from Kinetic Gravity Braiding
• G-inflation: inflation driven by the Galileon field
• Approaches to Understanding Cosmic Acceleration
• Analytic models of plausible gravitational lens potentials
• Evaluating backreaction with the peak model of structure formation
• Observational Constraints on Oscillating Dark-Energy Parametrizations
• Effects of shear and rotation on the spherical collapse model for clustering dark energy
• On the implementation of the spherical collapse model for dark energy models
• Growth index and statefinder diagnostic of Oscillating Dark Energy
• Approximation of the potential in scalar field dark energy models
• Clustering dark energy and halo abundances
• An Improved Semi-Analytical Spherical Collapse Model for Non-linear Density Evolution
• Growth Rate in the Dynamical Dark Energy Models
• Dark sector evolution in Horndeski models
• Spherical collapse of dark matter haloes in tidal gravitational fields
• Effects of tidal gravitational fields in clustering dark energy models

Cited by in corpus (11)

• Dark matter axion detection in the radio/mm-waveband
• Redshift evolution of the dark matter haloes shapes
• Spherical collapse in Generalized Dark Matter models
• Growth of non-linear structures and spherical collapse in the Galileon Ghost Condensate model
• Improved Lemaitre-Tolman model and the mass and turn-around radius in group of galaxies II: the role of dark energy
• Structure formation and quasi-spherical collapse from initial curvature perturbations with numerical relativity simulations
• A spherical hydrodynamical model of cosmic voids in ΛCDM and beyond
• Morphology of relaxed and merging galaxy clusters. Analytical models for monolithic Minkowski functionals
• Tidal virialization of dark matter haloes with clustering dark energy
• Improved Lemaitre-Tolman model and the mass and turn-around radius in group of galaxies
• Effects of dynamical friction on perturbations for evolving dark energy