Robust Cosmological Bounds on Neutrinos and their Combination with Oscillation Results

Abstract

We perform a global analysis of cosmological observables in generalized cosmologies which depart from $\Lambda$CDM models by allowing non-vanishing curvature ${\Omega }_k\ne 0$, dark energy with equation of state with $\omega \ne -1$, the presence of additional relativistic degrees of freedom $\Delta N_{\mathrm{rel}}$, and neutrino masses ${\Omega }_{\nu }\ne 0$. By combining the data from cosmic microwave background (CMB) experiments (in particular the latest results from WMAP-7), the present day Hubble constant (H0) measurement, the high-redshift Type-I supernovae (SN) results and the information from large scale structure (LSS) surveys, we determine the parameters in the 10-dimensional parameter space for such models. We present the results from the analysis when the full shape information from the LSS matter power spectrum (LSSPS) is included versus when only the corresponding distance measurement from the baryon acoustic oscillations (BAO) is accounted for. We compare the bounds on the neutrino mass scale in these generalized scenarios with those obtained for the 6+1 parameter analysis in $\Lambda \mathrm{CDM}+m_{\nu }$ models and we also study the dependence of those on the set of observables included in the analysis. Finally we combine these results with the information on neutrino mass differences and mixing from the global analysis of neutrino oscillation experiments and derive the presently allowed ranges for the two laboratory probes of the absolute scale of neutrino mass: the effective electron neutrino mass in single beta decay and the effective Majorana neutrino mass in neutrinoless $\beta \beta$ decay.

arXiv comment19 pages, 4 figures. Acknowledgments corrected

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