Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-07-28
JCAP0711:026,2007
Astronomy and Astrophysics
Astrophysics
15 pages, LateX file; one comment after Eq.(36) and formula (44) added in order to underline procedure and main results. Accep
Scientific paper
10.1088/1475-7516/2007/11/026
We perform an analytical study of the Integrated Sachs-Wolfe (ISW) effect within the framework of Unified Dark Matter models based on a scalar field which aim at a unified description of dark energy and dark matter. Computing the temperature power spectrum of the Cosmic Microwave Background anisotropies we are able to isolate those contributions that can potentially lead to strong deviations from the usual ISW effect occurring in a $\Lambda$CDM universe. This helps to highlight the crucial role played by the sound speed in the Unified Dark Matter models. Our treatment is completely general in that all the results depend only on the speed of sound of the dark component and thus it can be applied to a variety of unified models, including those which are not described by a scalar field but relies on a single dark fluid.
Bartolo Nicola
Bertacca Daniele
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