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Abstract: We perform an analytical study of the Integrated Sachs-Wolfe ISW effectwithin the framework of Unified Dark Matter models based on a scalar fieldwhich aim at a unified description of dark energy and dark matter. Computingthe temperature power spectrum of the Cosmic Microwave Background anisotropieswe are able to isolate those contributions that can potentially lead to strongdeviations from the usual ISW effect occurring in a $\Lambda$CDM universe. Thishelps to highlight the crucial role played by the sound speed in the UnifiedDark Matter models. Our treatment is completely general in that all the resultsdepend only on the speed of sound of the dark component and thus it can beapplied to a variety of unified models, including those which are not describedby a scalar field but relies on a single dark fluid.



Autor: Daniele Bertacca, Nicola Bartolo Physics Dept., and INFN, Padova, Italy

Fuente: https://arxiv.org/







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