The Nature of Dark Energy from deep Cluster Abundance

Details The Nature of Dark Energy from deep Cluster Abundance The Nature of Dark Energy from deep Cluster Abundance

2004-12-02

arxiv.org/abs/astro-ph/0412054v1

Astronomy and Astrophysics

Astrophysics

12 pages, 4 figures; submitted to ApJ

Scientific paper

We show that using the redshift dependence of the deep cluster abundance to detect the nature of Dark Energy is a serious challenge. We compare the expected differences between flat LCDM models, with different Omega_mo, with the difference between LCDM and dynamical DE models. In the former case, cluster abundances in comoving volume and geometrical factors act in the same direction, yielding a significant difference between the expected angular densities. On the contrary, when we keep a constant Omega_mo and change the DE nature,abundances in comoving volume and geometrical factors act in the opposite direction, so that the expected differences in angular densities reduce to small factors.

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