We investigate how the dark energy properties change the cosmological limits on sterile neutrino parameters by using recent cosmological observations .
We consider the simplest dynamical dark energy models , the w CDM model and the holographic dark energy ( HDE ) model , to make an analysis .
The cosmological observations used in this work include the Planck 2015 CMB temperature and polarization data , the baryon acoustic oscillation data , the type Ia supernova data , the Hubble constant direct measurement data , and the Planck CMB lensing data .
We find that , m _ { \nu, { sterile } } ^ { eff } < 0.2675 eV and N _ { eff } < 3.5718 for \Lambda CDM cosmology , m _ { \nu, { sterile } } ^ { eff } < 0.5313 eV and N _ { eff } < 3.5008 for w CDM cosmology , and m _ { \nu, { sterile } } ^ { eff } < 0.1989 eV and N _ { eff } < 3.6701 for HDE cosmology , from the constraints of the combination of these data .
Thus , without the addition of measurements of growth of structure , only upper limits on both m _ { \nu, { sterile } } ^ { eff } and N _ { eff } can be derived , indicating that no evidence of the existence of a sterile neutrino species with eV-scale mass is found in this analysis .
Moreover , compared to the \Lambda CDM model , in the w CDM model the limit on m _ { \nu, { sterile } } ^ { eff } becomes much looser , but in the HDE model the limit becomes much tighter .
Therefore , the dark energy properties could significantly influence the constraint limits of sterile neutrino parameters .