Strong bounds on sum of neutrino masses in a 12 parameter extended scenario with non-phantom dynamical dark energy (w(z)ge -1)

Abstract

We obtained constraints on a 12 parameter extended cosmological scenario including non-phantom dynamical dark energy (NPDDE) with CPL parametrization. We also include the six Lambda CDM parameters, number of relativistic neutrino species (N_{text {eff}}) and sum over active neutrino masses (sum m_{nu }), tensor-to-scalar ratio (r_{0.05}), and running of the spectral index (n_{run}). We use CMB Data from Planck 2015; BAO Measurements from SDSS BOSS DR12, MGS, and 6dFS; SNe Ia Luminosity Distance measurements from the Pantheon Sample; CMB B-mode polarization data from BICEP2/Keck collaboration (BK14); Planck lensing data; and a prior on Hubble constant (73.24pm 1.74 km/s/Mpc) from local measurements (HST). We have found strong bounds on the sum of the active neutrino masses. For instance, a strong bound of sum m_{nu } < 0.123 eV (95% CL) comes from Planck+BK14+BAO. Although we are in such an extended parameter space, this bound is stronger than a bound of sum m_{nu }< 0.158 eV (95% CL) obtained in Lambda text {CDM}+sum m_{nu } with Planck+BAO. Varying A_{text {lens}} instead of r_{0.05} however leads to weaker bounds on sum m_{nu }. Inclusion of the HST leads to the standard value of N_{text {eff}} = 3.045 being discarded at more than 68% CL, which increases to 95% CL when we vary A_{text {lens}} instead of r_{0.05}, implying a small preference for dark radiation, driven by the H_0 tension.