Evolution of spherical overdensities in new agegraphic dark energy model

Abstract

We study the structure formation by investigating the spherical collapse model in the context of new agegraphic dark energy model in flat FRW cosmology. We compute the perturbational quantities $g(a)$, ${\delta }_c(z_c)$, $\lambda (z_c)$, $\xi (z_c)$, ${\Delta }_{vir}(z_c)$, $\log [\nu f(\nu )]$ and $\log [n(k)]$ for the new agegraphic dark energy model and compare the results with those of EdS and $\Lambda CDM$ models. We find that there is a dark energy dominated universe at low redshifts and a matter dominated universe at high redshifts in agreement with observations. Also, the size of structures, the overdense spherical region, and the halo size in the new agegraphic dark energy model are found smaller, denser, and larger than those of EdS and $\Lambda CDM$ models. We compare our results with the results of tachyon scalar field and holographic dark energy models.

arXiv comment9 pages, 15 figures

References in corpus (25)

• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Measurements of Omega and Lambda from 42 High-Redshift Supernovae
• Dynamics of dark energy
• Large scale bias and the peak background split
• A Flat Universe from High-Resolution Maps of the Cosmic Microwave Background Radiation
• A Model of Holographic Dark Energy
• An excursion set model of hierarchical clustering: Ellipsoidal collapse and the moving barrier
• Cluster Abundance Constraints on Quintessence Models
• Quintom Cosmology: Theoretical implications and observations
• A New Model of Agegraphic Dark Energy
• The Cluster Abundance in Flat and Open Cosmologies
• Cosmological Constraints on New Agegraphic Dark Energy
• Skewness and Kurtosis in Large-Scale Cosmic Fields
• Holographic tachyon model of dark energy
• Structure formation in the presence of dark energy perturbations
• Cosmological structure formation in a homogeneous dark energy background
• Cosmological implications of Karolyhazy uncertainty relation
• Interacting tachyon dark energy in non-flat universe
• Space-time in light of Karolyhazy uncertainty relation
• A comparison of structure formation in minimally and non-minimally coupled quintessence models
• Mass Function of Low Mass Dark Halos
• On the Average Comoving Number Density of Halos
• Evolution of spherical overdensities in holographic dark energy models
• Effects of ghost dark energy perturbations on the evolution of spherical overdensities
• Relativistic virialization in the Spherical Collapse model for Einstein-de Sitter and ΛCDM cosmologies