scholarly journals Spherical collapse model with shear and angular momentum in dark energy cosmologies

2013 ◽  
Vol 430 (1) ◽  
pp. 628-637 ◽  
Author(s):  
A. Del Popolo ◽  
F. Pace ◽  
J. A. S. Lima
Keyword(s):  
Angular Momentum ◽  
Dark Energy ◽  
Spherical Collapse ◽  
Collapse Model

Improvements in the Spherical Collapse Model and Dark Energy Cosmologies

2014 ◽  
Vol 23 (3-4) ◽  
Author(s):  
A. Del Popolo
Keyword(s):  
Shear Stress ◽  
Angular Momentum ◽  
Dark Energy ◽  
Spherical Symmetry ◽  
Linear Density ◽  
Spherical Collapse ◽  
Collapse Model ◽  
Density Threshold ◽  
Stress Influence

AbstractIn the present paper, we study how the effects of deviations from spherical symmetry of a system, produced by angular momentum, and shear stress, influence typical parameters of the spherical collapse model, like the linear density threshold for collapse of the non-relativistic component (

scholarly journals Effects of shear and rotation on the spherical collapse model for clustering dark energy

2014 ◽  
Vol 445 (1) ◽  
pp. 648-659 ◽  
Author(s):  
Francesco Pace ◽  
Ronaldo C. Batista ◽  
Antonino Del Popolo
Keyword(s):  
Dark Energy ◽  
Spherical Collapse ◽  
Collapse Model

scholarly journals On the implementation of the spherical collapse model for dark energy models

2017 ◽  
Vol 2017 (10) ◽  
pp. 040-040 ◽  
Author(s):  
Francesco Pace ◽  
Sven Meyer ◽  
Matthias Bartelmann
Keyword(s):  
Dark Energy ◽  
Energy Models ◽  
Spherical Collapse ◽  
Collapse Model

THE INFLUENCE OF DARK ENERGY ON THE LARGE SCALE STRUCTURE FORMATION

2010 ◽  
Vol 25 (11n12) ◽  
pp. 874-884 ◽  
Author(s):  
SEOKCHEON LEE
Keyword(s):  
Dark Energy ◽  
Equation Of State ◽  
Structure Formation ◽  
Poisson Distribution ◽  
Large Scale ◽  
Density Perturbation ◽  
Spherical Collapse ◽  
Collapse Model ◽  
Small Scales ◽  
Large Scale Structure Formation

Inhomogeneity at small scales (Mpcs) of our universe is manifest from observations. In regions smaller than 8h-1 Mpc galaxies tend to cluster instead of showing a Poisson distribution. The properties of the spherical collapse model which approximately depicts this nonlinearity of the density perturbation are investigated when there exits dark energy. The evolution of a spherical perturbation depends only on the initial critical overdensity threshold for the collapse, δc and its value approaches to 1.58 instead of the conventionally known 1.69 independent of the value of the equation of state of dark energy.

scholarly journals Angular momentum in cluster Spherical Collapse Model

2011 ◽  
Vol 417 (4) ◽  
pp. 2554-2561 ◽  
Author(s):  
Guido Cupani ◽  
Marino Mezzetti ◽  
Fabio Mardirossian
Keyword(s):  
Angular Momentum ◽  
Spherical Collapse ◽  
Collapse Model

scholarly journals On the spherical collapse model in dark energy cosmologies

2004 ◽  
Vol 421 (1) ◽  
pp. 71-81 ◽  
Author(s):  
D. F. Mota ◽  
C. van de Bruck
Keyword(s):  
Dark Energy ◽  
Spherical Collapse ◽  
Collapse Model

scholarly journals EXTENDED SPHERICAL COLLAPSE AND THE ACCELERATING UNIVERSE

2013 ◽  
Vol 22 (08) ◽  
pp. 1350038 ◽  
Author(s):  
A. DEL POPOLO ◽  
F. PACE ◽  
J. A. S. LIMA
Keyword(s):  
Shear Stress ◽  
Angular Momentum ◽  
Linear Density ◽  
Accelerating Universe ◽  
De Sitter ◽  
Local Rotation ◽  
Spherical Collapse ◽  
Collapse Model ◽  
Density Threshold

The influence of the shear stress and angular momentum on the nonlinear spherical collapse model is discussed in the framework of the Einstein–de Sitter and ΛCDM models. By assuming that the vacuum component is not clustering within the homogeneous nonspherical overdensities, we show how the local rotation and shear affect the linear density threshold for collapse of the nonrelativistic component (δc) and its virial overdensity (ΔV). It is also found that the net effect of shear and rotation in galactic scale is responsible for higher values of the linear overdensity parameter as compared with the standard spherical collapse model (no shear and rotation).

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