Cosmological parameters degeneracies and non-Gaussian halo bias
NAGIOS: RODERIC FUNCIONANDO

Cosmological parameters degeneracies and non-Gaussian halo bias

DSpace Repository

Cosmological parameters degeneracies and non-Gaussian halo bias

Show simple item record

dc.contributor.author Carbone, Carmelita
dc.contributor.author Mena Requejo, Olga
dc.contributor.author Verde, Licia
dc.date.accessioned 2014-09-11T08:10:05Z
dc.date.available 2014-09-11T08:10:05Z
dc.date.issued 2010
dc.identifier.uri http://hdl.handle.net/10550/37725
dc.description.abstract We study the impact of the cosmological parameters uncertainties on the measurements of primordial non-Gaussianity through the large-scale non-Gaussian halo bias effect. While this is not expected to be an issue for the standard Lambda CDM model, it may not be the case for more general models that modify the large-scale shape of the power spectrum. We consider the so-called local non-Gaussianity model, parametrized by the f(NL) non-Gaussianity parameter which is zero for a Gaussian case, and make forecasts on f(NL) from planned surveys, alone and combined with a Planck CMB prior. In particular, we consider EUCLID- and LSST-like surveys and forecast the correlations among f(NL) and the running of the spectral index alpha(s), the dark energy equation of state w, the effective sound speed of dark energy perturbations c(s)(2), the total mass of massive neutrinos M-nu = Sigma m(nu), and the number of extra relativistic degrees of freedom N-nu(rel). Neglecting CMB information on f(NL) and scales k > 0.03h/Mpc, we find that, if N-nu(rel) is assumed to be known, the uncertainty on cosmological parameters increases the error on f(NL) by 10 to 30% depending on the survey. Thus the f(NL) constraint is remarkable robust to cosmological model uncertainties. On the other hand, if N-nu(rel) is simultaneously constrained from the data, the f(NL) error increases by similar to 80%. Finally, future surveys which provide a large sample of galaxies or galaxy clusters over a volume comparable to the Hubble volume can measure primordial non-Gaussianity of the local form with a marginalized 1-sigma error of the order Delta f(NL) similar to 2 - 5, after combination with CMB priors for the remaining cosmological parameters. These results are competitive with CMB bispectrum constraints achievable with an ideal CMB experiment.
dc.language.iso eng
dc.relation.ispartof Journal Of Cosmology And Astroparticle Physics, 2010, vol. 10, num. 7, p. 020
dc.rights.uri info:eu-repo/semantics/openAccess
dc.source Carbone, Carmelita Mena Requejo, Olga Verde, Licia 2010 Cosmological parameters degeneracies and non-Gaussian halo bias Journal Of Cosmology And Astroparticle Physics 10 7 020
dc.subject Astrofísica
dc.title Cosmological parameters degeneracies and non-Gaussian halo bias
dc.type info:eu-repo/semantics/article
dc.date.updated 2014-09-11T08:10:05Z
dc.identifier.doi http://dx.doi.org/10.1088/1475-7516/2010/07/020
dc.identifier.idgrec 097556

View       (1.254Mb)

This item appears in the following Collection(s)

Show simple item record

Search DSpace

Advanced Search

Browse

Statistics