Spherical Collapse Model And Dark Energy(II)

Details Spherical Collapse Model And Dark Energy(II) Spherical Collapse Model And Dark Energy(II)

2005-05-09

arxiv.org/abs/astro-ph/0505164v2

Astronomy and Astrophysics

Astrophysics

comparing with previous works is added, some errors are corrected

Scientific paper

This is a second paper of a series of two. In this paper, we directly correct the problem pointed out in the first paper of this series, dark energy does not cluster on the scale of galaxy clusters, but the current describing the flowing of dark energies outside the clusters is ignored in almost all the previous papers. We set up and solve a first order differential equation which describes the evolution of the clusters in a back ground universe containing dark energies. From the solution we extract the key parameters of the model and find them depending on the equation of state coefficients of dark energies rather non-trivially. We then apply the results in Press-Scheter theory and calculate the number density of galaxy clusters and its evolutions, we find the observable quantities are strongly affected by the equation of state coefficients of dark energies.

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