Dark radiation in extended cosmological scenarios
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Dark radiation in extended cosmological scenarios

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Dark radiation in extended cosmological scenarios

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dc.contributor.author Archidiacono, Maria
dc.contributor.author Giusarma, Elena
dc.contributor.author Melchiorri, Alessandro
dc.contributor.author Mena Requejo, Olga
dc.date.accessioned 2014-07-24T11:00:29Z
dc.date.available 2014-07-24T11:00:29Z
dc.date.issued 2012
dc.identifier.uri http://hdl.handle.net/10550/37305
dc.description.abstract Recent cosmological data have provided evidence for a 'dark' relativistic background at high statistical significance. Parameterized in terms of the number of relativistic degrees of freedom Neff, however, the current data seems to indicate a higher value than the one expected in the standard scenario based on three active neutrinos. This dark radiation component can be characterized not only by its abundance but also by its clustering properties, as its effective sound speed and its viscosity parameter. It is therefore crucial to study the correlations among the dark radiation properties and key cosmological parameters, as the dark energy equation of state or the running of the scalar spectral index, with current and future CMB data. We find that dark radiation with viscosity parameters different from their standard values may be misinterpreted as an evolving dark energy component or as a running spectral index in the power spectrum of primordial fluctuations.
dc.language.iso eng
dc.relation.ispartof Physical Review D, 2012, vol. 86, num. 4, p. 043509
dc.rights.uri info:eu-repo/semantics/openAccess
dc.source Archidiacono, Maria Giusarma, Elena Melchiorri, Alessandro Mena Requejo, Olga 2012 Dark radiation in extended cosmological scenarios Physical Review D 86 4 043509
dc.subject Física
dc.title Dark radiation in extended cosmological scenarios
dc.type info:eu-repo/semantics/article
dc.date.updated 2014-07-24T11:00:29Z
dc.identifier.doi http://dx.doi.org/10.1103/PhysRevD.86.043509
dc.identifier.idgrec 084360

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