Cosmic constraint on massive neutrinos in viable f(R) gravity with producing Λ Λ CDM background expansion

2016/06/30 by Jianbo Lu, Molin Liu, Yabo Wu +2 · 25 citations
Physics and Astronomy · #COSMIC cancer database #Cold dark matter #Cosmic background radiation #Cosmic microwave background #Cosmic neutrino background #Cosmology #Cosmology and Gravitation Theories #Neutrino #Noncommutative and Quantum Gravity Theories #Particle physics theoretical and experimental studies #Sterile neutrino #astro-ph.CO #gr-qc

paper · pdf · doi:10.1140/epjc/s10052-016-4525-7

published in The European Physical Journal C 76(12) (Springer Science+Business Media) · 11 pages, 4 figures

openalex created_date 2016/06/24 · openalex publication_date 2016/12/01 · arxiv created 2016/12/11 · arxiv updated 2017/01/04 · openalex updated_date 2026/08/05

Abstract

Tensions between several cosmic observations were found recently, such as the inconsistent values of H₀ (or σ ₈ ) were indicated by the different cosmic observations. Introducing the massive neutrinos in Λ CDM could potentially solve the tensions. Viable f(R) gravity producing Λ CDM background expansion with massive neutrinos is investigated in this paper. We fit the current observational data: Planck-2015 CMB, RSD, BAO, and SNIa to constrain the mass of neutrinos in viable f(R) theory. The constraint results at 95% confidence level are: Σ m_ν <0.202 eV for the active-neutrino case, m_{ν , sterile}^eff<0.757 eV with N_eff<3.22 for the sterile neutrino case. For the effects due to the mass of the neutrinos, the constraint results on model parameter at 95% confidence level become f_R0× 10^-6> -1.89 and f_R0× 10^-6> -2.02 for two cases, respectively. It is also shown that the fitting values of several parameters much depend on the neutrino properties, such as the cold dark matter density, the cosmological quantities at matter–radiation equality, the neutrino density and the fraction of baryonic mass in helium. Finally, the constraint result shows that the tension between direct and CMB measurements of H₀ gets slightly weaker in the viable f(R) model than that in the base Λ CDM model.

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