523617.fig.001
Figure 1: The evolution of the equation of state 𝑤 𝑘 as a function of redshift 𝑧 in purely kinetic k-essence cosmology and the evolution of the equation of state of standard Λ CDM cosmology 𝑤 Λ as a function of redshift 𝑧 . Labels “a” and “b” mark the range of redshifts of transition from deceleration to acceleration of the expansion of the Universe.