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We show that ten(one) years operation of the ultimate DECIGO (DECihertzInterferometer Gravitational wave Observatory) can determine the cosmicequation of the state with such accuracy that 0.06%(3%), 0.08%(4%) and0.06%(3%) for $\Omega_m$, $\Omega_w$ and $w$, respectively. In more realisticcase of practical DECIGO or BBO (Big Bang Observer), $w$ will be determinedwithin $\sim 10%$ by ten years observation assuming the flat universe model.Hence, the DECIGO or BBO will give an independent determination of the cosmicequation of the state.Comment: 9 pages, 6 figures; accepted for publication in Prog. Theor. Phy

Determination of the Equation of State of the Universe Using 0.1 Hz Gravitational Wave Detectors