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The limit on for tachyon dark energy
Ximing Chen, Yungui Gong
We get the same degeneracy relation between and for the tachyon fields as for quintessence and phantom fields. Our results show that the dynamics of scalar fields with…
The tension on the cosmological parameters from different observational data
Qing Gao, Yungui Gong
Planck measurements of the cosmic microwave background power spectra find a lower value of the Hubble constant and a higher value of the fractional matter energy density $Ω_{…
Testing the effects from dark radiation
Yi Zhang, Yungui Gong
In this letter, the effects of dark radiation (DR) are tested. Theoretically, the phase-space analysis method is applied to check whether the model is consist with the history of o…
On the effect of the degeneracy between w_0 and w_a
Yungui Gong, Qing Gao
The dynamics of scalar fields as dark energy is well approximated by some general relations between the equation of state parameter and the fraction energy density . Ba…