Open AccessVirialization of cosmological structures in models with time‐varying equation of state
Author(s) -
Basilakos Spyros,
Voglis Nikos
Publication year - 2007
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2006.11158.x
Subject(s) - physics , equation of state , cluster (spacecraft) , cosmic cancer database , dark energy , astrophysics , structure formation , universe , metric expansion of space , cosmology , galaxy cluster , statistical physics , quantum mechanics , galaxy , computer science , programming language
We study the virialization of the cosmic structures in the framework of flat cosmological models where the dark energy component plays an important role in the global dynamics of the Universe. In particular, our analysis focuses on the study of the spherical matter perturbations, as the latter decouple from the background expansion, start to ‘turn around’ and finally collapse. We generalize this procedure, taking into account models with an equation of state which vary with time, and provide a complete formulation of the cluster virialization attempting to address the non‐linear regime of structure formation. In particular, assuming that clusters have collapsed prior to the epoch of z f ≃ 1.4, in which the most distant cluster has been found, we show that the behaviour of the spherical collapse model depends on the functional form of the equation of state.