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Prog. Theor. Phys. Vol. 113 No. 1 (2005) pp. 63-71

[ Full Text PDF : FREE ACCESS (166K) ]

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

Ryuichi Takahashi1 and Takashi Nakamura2

1Division of Theoretical Astrophysics,
National Astronomical Observatory, Mitaka 181-8588, Japan
2Department of Physics, Kyoto University, Kyoto 606-8502, Japan

(Received October 13, 2004)

Abstract:

We show that a ten year operation of the ultimate DECIGO (DECihertz Interferometer Gravitational wave Observatory) could determine the cosmic equation of state with 0.06%, 0.08% and 0.06% accuracies for Ωm, Ωw and w, respectively, while a one year operation could do so with 3%, 4% and 3% accuracies. In the more realistic case of a practical DECIGO or BBO (Big Bang Observer), w should be determined within ∼10% by a ten year observation assuming the flat universe model. Hence, a DECIGO or BBO should give an independent determination of the cosmic equation of state.


URL : http://ptp.ipap.jp/link?PTP/113/63/
DOI : 10.1143/PTP.113.63

[ Full Text PDF : FREE ACCESS (166K) ] Citation:

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