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The eq. of motion gives $x=(L/6)(V/3H^2)$ and with a solution $x=([1+2 L/3(1+y)]^{1/2}-1)(1+y)/2$ where $y\\equiv \\rm/V$ and $L\\equiv (V'/V)^2 (1+q)^2,\\, q\\equiv\\ddot\\p/V'$. Since the universe is accelerating at present time we use the slow roll approximation in which case we have $|q|\\ll 1$ and $L\\simeq (V'/V)^2$. However, the derivation of $L$ is exact and has no approximation. 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We use an equation of state $w=(x-1)/(x+1)$, with $x=E_k/V$, the ratio of kinetic energy $E_k=\\dot\\phi^2/2$ and potential $V$. The eq. of motion gives $x=(L/6)(V/3H^2)$ and with a solution $x=([1+2 L/3(1+y)]^{1/2}-1)(1+y)/2$ where $y\\equiv \\rm/V$ and $L\\equiv (V'/V)^2 (1+q)^2,\\, q\\equiv\\ddot\\p/V'$. Since the universe is accelerating at present time we use the slow roll approximation in which case we have $|q|\\ll 1$ and $L\\simeq (V'/V)^2$. However, the derivation of $L$ is exact and has no approximation. 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