Limits on coupling between dark components

Details Limits on coupling between dark components Limits on coupling between dark components

2007-03-13

arxiv.org/abs/astro-ph/0703303v2

JCAP 0706:020,2007

Astronomy and Astrophysics

Astrophysics

20 pages, 13 figures, abstract revised, some points clarified, 2 figures added. Accepted for publication in JCAP

Scientific paper

10.1088/1475-7516/2007/06/020

DM--DE coupling can be a phenomenological indication of a common origin of the dark cosmic components. In this work we outline a new constraint to coupled--DE models: the coupling can partially or totally suppress the Meszaros effect, yielding transfered spectra with quite a soft bending above $k_{hor,eq}$. Models affected by this anomaly do not show major variation in the CMB anisotropy spectrum and it is herefore hard to reconcile them with both CMB and deep sample data, through the same value of the primeval spectral index.

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