状态方程P=γρ~Γ是比P=nρ更一般的模型,本文讨论方程为P=γρ~Γ,引力源为理想流体的爱因斯坦场方程,在R-W度规下无宇宙因子时......

Our aim in the present article is to introduce and study new types of retractions of closed flat Robertson-Walker W4 mod......

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