Abstract:
Recently there have been reports of finding a lower bound on the neutrino mass parameter (Σmν) when using the
Atacama Cosmology Telescope (ACT) and SPTpol data; however, these bounds on the Σmν are still weaker for
most cases around the 1σ level. In this context, here in this work, we study the consequences of using an enlarged
four parameter dynamical dark energy equation of state on the neutrino mass parameter as well as on the Hubble
and S8 tensions. The four parameter dark energy equation of state incorporates a generic nonlinear monotonic
evolution of the dark energy equation of state, where the four parameters are the early and the present value of the
equation of state, the transition scale factor, and the sharpness of the transition. We report that with lensingmarginalized Planck + BAO + Pantheon and prior on absolute magnitude MB, and KIDS/Viking S8 prior, the
model favors a nonzero value for the neutrino mass parameter at most at the 1σ level (S =n -
+ m 0.1847 0.165
0.0698 eV). In
this case this model also brings down the Hubble tension to a 2.5σ level and the S8 tension to a ∼1.5σ level. This
model also provides tighter constraints on the value of the dark energy equation of state at present epoch w0
( = - -
+ w0 0.9901 0.0766
0.0561) in comparison to the Chevalier-Polarski and Linder-like parameterization.
