Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-08-04
Prog.Theor.Phys. 100 (1998) 1077-1082
Astronomy and Astrophysics
Astrophysics
5 pages + 1 figure, one reference added, Prog.Theor.Phys. in press
Scientific paper
10.1143/PTP.100.1077
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 $c_{s0}(1+w_{\rm x0})=0$ ($c_{s0}$ is the total sound speed of the matter component and $w_{\rm x0}$=$p_{\rm x0}/\rho_{\rm x0}$).
Chiba Takeshi
Nakamura Takashi
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