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Abstract: We explore the 2013 Planck likelihood function with a high-precision multi-dimensional minimizer (Minuit). This allows a refinement of the ?CDM best-fit solution with respect to previously-released results, and the construction of frequentist confidence intervals using profile likelihoods. The agreement with the cosmological results from the Bayesian framework is excellent, demonstrating the robustness of the Planck results to the statistical methodology. We investigate the inclusion of neutrino masses, where more significant differences may appear due to the non-Gaussian nature of the posterior mass distribution. By applying the Feldman-Cousins prescription, we again obtain results very similar to those of the Bayesian methodology. However, the profile-likelihood analysis of the cosmic microwave background (CMB) combination (Planck+WP+highL) reveals a minimum well within the unphysical negative-mass region. We show that inclusion of the Planck CMB-lensing information regularizes this issue, and provide a robust frequentist upper limit ? m? = 0.26 eV (95% confidence) from the CMB+lensing+BAO data combination.
Fuente: Astronomy & Astrophysics, 2014, 566, A54
Editorial: EDP Sciences
Fecha de publicación: 01/06/2014
Nº de páginas: 10
Tipo de publicación: Artículo de Revista
DOI: 10.1051/0004-6361/201323003
ISSN: 0004-6361,1432-0746
Url de la publicación: https://doi.org/10.1051/0004-6361/201323003
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ADE, P. A. R.
RITA BELEN BARREIRO VILAS
JOSE MARIA DIEGO RODRIGUEZ
JOAQUIN GONZALEZ-NUEVO GONZALEZ
DIEGO HERRANZ MUÑOZ
MARCOS LOPEZ-CANIEGO ALCARRIA
ENRIQUE MARTINEZ GONZALEZ
LUIGI TOFFOLATTI
PATRICIO VIELVA MARTINEZ
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