标题： 具有多项式状态方程的暗能量 显示英文标题

标题： Dark energy with polytropic equation of state

摘要： 状态方程参数对于猜测暗能量的真实性质起着重要作用。在本文中，选择多项式状态方程 $p=\omega\rho^n$ 作为某些运动学 $\Lambda$-模型的状态方程，即 $\Lambda \sim (\dot a/a)^2$、$\Lambda \sim \ddot a/a$ 和 $\Lambda \sim \rho$。 尽管在尘埃情况（$\omega=0$）下，闭式解显示出与多方指数（$n$）无关，但在非尘埃情况下，一些新的可能性被打开，包括具有超负（$\omega<-1$）状态方程参数的幻影能量。 显示英文摘要

摘要： Equation of state parameter plays a significant role for guessing the real nature of dark energy. In the present paper polytropic equation of state $p=\omega\rho^n$ is chosen for some of the kinematical $\Lambda$-models viz., $\Lambda \sim (\dot a/a)^2$, $\Lambda \sim \ddot a/a$ and $\Lambda \sim \rho$. Although in dust cases ($\omega=0$) closed form solutions show no dependency on the polytropic index $n$, but in non-dust situations some new possibilities are opened up including phantom energy with supernegative ($\omega<-1$) equation of state parameter.