Geodesic
Conformal correspondence between Friedman type solutions in general relativity and Jordan--Brans--Dicke theory of gravity
Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 3 (2008), pp. 70-75

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Solutions for the cosmological problem are obtained by using the conformal transformations connecting general relativity and Jordan–Brans–Dicke theory of gravity. The cases of equations of state $P=\dfrac{1}{3}\varepsilon$ and $P=0$ are considered. 
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A. S. Piloyan. Conformal correspondence between Friedman type solutions in general relativity and Jordan--Brans--Dicke theory of gravity. Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 3 (2008), pp. 70-75. http://geodesic.mathdoc.fr/item/UZERU_2008_3_a9/