https://doi.org/10.1140/epjc/s10052-019-6762-z
Regular Article - Theoretical Physics
Strong bounds on sum of neutrino masses in a 12 parameter extended scenario with non-phantom dynamical dark energy (
)
1
Harish-Chandra Research Institute, Chhatnag Road, Jhunsi, Prayagraj (Allahabad), 211019, India
2
Homi Bhabha National Institute, Training School Complex, Anushaktinagar, Mumbai, 400094, India
3
Indian Statistical Institute, Kolkata, 203 BT Road, Kolkata, 700108, India
* e-mail: shouvikroychoudhury@hri.res.in
Received:
2
August
2018
Accepted:
8
March
2019
Published online:
21
March
2019
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 CDM parameters, number of relativistic neutrino species (
) and sum over active neutrino masses (
), tensor-to-scalar ratio (
), and running of the spectral index (
). 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 (
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
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
0.158 eV (95% CL) obtained in
with Planck+BAO. Varying
instead of
however leads to weaker bounds on
. Inclusion of the HST leads to the standard value of
being discarded at more than 68% CL, which increases to 95% CL when we vary
instead of
, implying a small preference for dark radiation, driven by the
tension.
© The Author(s), 2019