Strong bounds on sum of neutrino masses in a 12 parameter extended scenario with non-phantom dynamical dark energy

• Published in: The European physical journal. C, Particles and fields Particles and fields, 2019-03, Vol.79 (3)
• Main Authors: Roy Choudhury, Shouvik, Naskar, Abhishek
• Format: Article
• Language: English
• Subjects: Dark energy; Energy (Physics); Ghosts; Radiation (Physics)
• ISSN: 1434-6044; 1434-6052
• DOI: 10.1140/epjc/s10052-019-6762-z

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 [Formula omitted]CDM parameters, number of relativistic neutrino species ( [Formula omitted]) and sum over active neutrino masses ( [Formula omitted]), tensor-to-scalar ratio ( [Formula omitted]), and running of the spectral index ( [Formula omitted]). 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 ( [Formula omitted] 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 [Formula omitted] 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 [Formula omitted] 0.158 eV (95% CL) obtained in [Formula omitted] with Planck+BAO. Varying [Formula omitted] instead of [Formula omitted] however leads to weaker bounds on [Formula omitted]. Inclusion of the HST leads to the standard value of [Formula omitted] being discarded at more than 68% CL, which increases to 95% CL when we vary [Formula omitted] instead of [Formula omitted], implying a small preference for dark radiation, driven by the [Formula omitted] tension.