Impact of Uncertainties in the Cosmological Parameters on the Measurement of Primordial non-Gaussianity

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dc.creatorLiguori, M.
dc.creatorRiotto, A.
dc.date2008-08-24
dc.date.accessioned2026-07-07T12:22:29Z
dc.date.available2026-07-07T12:22:29Z
dc.descriptionWe study the impact of cosmological parameters' uncertainties on estimates of the primordial NG parameter f_NL in local and equilateral models of non-Gaussianity. We show that propagating these errors increases the f_NL relative uncertainty by 16% for WMAP and 5 % for Planck in the local case, whereas for equilateral configurations the correction term are 14% and 4%, respectively. If we assume for local f_NL a central value of order 60, according to recent WMAP 5-years estimates, we obtain for Planck a final correction Δf_NL = 3. Although not dramatic, this correction is at the level of the expected estimator uncertainty for Planck, and should then be taken into account when quoting the significance of an eventual future detection. In current estimates of f_NL the cosmological parameters are held fixed at their best-fit values. We finally note that the impact of uncertainties in the cosmological parameters on the final f_NL error bar would become totally negligible if the parameters were allowed to vary in the analysis and then marginalized over.
dc.description10 pages, 3 figures, submitted to Phys. Rev. D
dc.identifierhttps://arxiv.org/abs/0808.3255
dc.identifierhttp://arxiv.org/abs/0808.3255
dc.identifierPhys.Rev.D78:123004,2008
dc.identifierdoi:10.1103/PhysRevD.78.123004
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/213668
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectHigh Energy Physics - Phenomenology
dc.titleImpact of Uncertainties in the Cosmological Parameters on the Measurement of Primordial non-Gaussianity
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