Constraints on active and sterile neutrinos in an interacting dark
  energy cosmology
  We investigate the impacts of dark energy on constraining massive
(active/sterile) neutrinos in interacting dark energy (IDE) models by using the
current observations. We employ two typical IDE models, the interacting $w$
cold dark matter (I$w$CDM) model and the interacting holographic dark energy
(IHDE) model, to make an analysis. To avoid large-scale instability, we use the
parameterized post-Friedmann approach to calculate the cosmological
perturbations in the IDE models. The cosmological observational data used in
this work include the Planck cosmic microwave background (CMB) anisotropies
data, the baryon acoustic oscillation data, the type Ia supernovae data, the
direct measurement of the Hubble constant, the weak lensing data, the
redshift-space distortion data, and the CMB lensing data. We find that the dark
energy properties could influence the constraint limits of active neutrino mass
and sterile neutrino parameters in the IDE models. We also find that the dark
energy properties could influence the constraints on the coupling strength
parameter $\beta$, and a positive coupling constant, $\beta>0$, can be detected
at the $2.5\sigma$ statistical significance for the IHDE+$\nu_s$ model by using
the all-data combination. In addition, we also discuss the "Hubble tension"
issue in these scenarios. We find that the $H_0$ tension can be effectively
relieved by considering massive sterile neutrinos, and in particular in the
IHDE+$\nu_s$ model the $H_0$ tension can be reduced to be at the $1.28\sigma$
level.
