The Nature of dark energy from deep cluster abundance - INSPIRE

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The Nature of dark energy from deep cluster abundance

P. Solevi
(
- Milan Bicocca U. and
- INFN, Milan
)
,
R. Mainini
(
- Milan Bicocca U. and
- INFN, Milan
)
,
S.A. Bonometto
(
- Milan Bicocca U. and
- INFN, Milan
)

Dec, 2004

12 pages

e-Print:

astro-ph/0412054 [astro-ph]

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Abstract: (arXiv)

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.

Note:

Submitted to Astrophys.J.

COSMOLOGICAL PARAMETERS

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