ISW effect in Unified Dark Matter Scalar Field Cosmologies: an analytical approach

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dc.creatorBertacca, Daniele
dc.creatorBartolo, Nicola
dc.date2007-07-28
dc.date2008-02-13
dc.date.accessioned2026-07-07T11:41:38Z
dc.date.available2026-07-07T11:41:38Z
dc.descriptionWe 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 $Λ$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.
dc.description15 pages, LateX file; one comment after Eq.(36) and formula (44) added in order to underline procedure and main results. Accepted for publication in JCAP; some typos corrected
dc.identifierhttps://arxiv.org/abs/0707.4247
dc.identifierhttp://arxiv.org/abs/0707.4247
dc.identifierJCAP0711:026,2007
dc.identifierdoi:10.1088/1475-7516/2007/11/026
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/200607
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Theory
dc.titleISW effect in Unified Dark Matter Scalar Field Cosmologies: an analytical approach
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