We consider cosmological models with a non-scale-invariant spectrum of primordial perturbations and assess whether they represent a viable alternative to the concordance Lambda CDM model. We find that in the framework of a model selection analysis, the WMAP and 2dF data do not provide any conclusive evidence in favor of one or the other kind of model. However, when a marginalization over the entire space of nuisance parameters is performed, models with a modified primordial spectrum and Omega(A) = 0 are strongly disfavored.
Inflation with primordial broken power law spectrum as an alternative to the concordance cosmological model / Pandolfi, Stefania; Elena, Giusarma; Massimiliano, Lattanzi; Melchiorri, Alessandro. - In: PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY. - ISSN 1550-7998. - 81:10(2010), pp. 103007-103014. [10.1103/physrevd.81.103007]
Inflation with primordial broken power law spectrum as an alternative to the concordance cosmological model
PANDOLFI, STEFANIA;MELCHIORRI, Alessandro
2010
Abstract
We consider cosmological models with a non-scale-invariant spectrum of primordial perturbations and assess whether they represent a viable alternative to the concordance Lambda CDM model. We find that in the framework of a model selection analysis, the WMAP and 2dF data do not provide any conclusive evidence in favor of one or the other kind of model. However, when a marginalization over the entire space of nuisance parameters is performed, models with a modified primordial spectrum and Omega(A) = 0 are strongly disfavored.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
