The Luminosity Distance,the Equation of State,and the Geometry of the Universe
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概要
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The second derivative of the luminosity distance with respect to the redshift is written in terms of the deceleration parameter q_0. We point out that the third derivative contains the information regarding the sound speed of cosmic matter as well as the curvature of the universe. We restrict physically possible parameter ranges of the coefficients. It is found that there is a relation between the coefficients in a flat universe model with matter such that c_<s0>(1 + w_<x0>) = 0 (c_<s0> is the total sound speed of the matter component and w_<x0> = P_<x0>/ρ_<x0>).
- 理論物理学刊行会の論文
- 1998-11-25
著者
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Nakamura Takashi
Yukawa Institute for Theoretical Physics, Kyoto University
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Chiba Takeshi
Department Of Functional Molecular Chemistry Kobe Pharmaceutical University
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CHIBA Takeshi
Department of Physics,University of Tokyo
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