Equation Icon  ------------- ∘ ρ0 ( ρ0 ) a = a0exp [H0 (t − t0)], H0 = κ --- 1 + --- , for ρℰ = 0, (202 ) ∘ ---- 3 2λ 2 -m- a = H sinh [2H0 (t − t0)] for ρℰ > 0. (203 ) 0