Quintessence Model and Cosmic Microwave Background
  A particular kind of quintessence is considered, with equation of motion $p_Q/\rho_Q = -1$, corresponding to a cosmological term with time-dependence $\Lambda(t) = \Lambda(t_0) (R(t_0)/R(t))^{P}$ and we examine how values of $\Omega_m$ and $\Omega_{\Lambda}$ depend on $P$. 
Paul H. Frampton