期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 4, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2017/04/003
关键词
cosmological parameters from CMBR; big bang nucleosynthesis; cosmological neutrinos
资金
- Fundacao Carlos Chagas Filho de Amparo a Pesquisa do Estado do Rio de Janeiro (FAPERJ-fellowship Nola 10)
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES) [88887.116715/2016-00]
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)
- FAPERJ
We combine current measurements of the local expansion rate, H-0, and Big Bang Nucleosynthesis (BBN) estimates of helium abundance with the latest cosmic microwave background (CMB) data from the Planck Collaboration to discuss the observational viability of the scale invariant Harrison-Zeldovch-Peebles (HZP) spectrum. We also analyze some of its extensions, namely, HZP + Y-P and HZP + N-eff, where Y-P is the primordial helium mass fraction and Neff is the effective number of relativistic degrees of freedom. We perform a Bayesian analysis and show that the latter model is favored with respect to the standard cosmology for values of N-eff lying in the interval 3.70 +/- 0.13 (1 sigma), which is currently allowed by some independent analyses.
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