Dark energy with polytropic equation of state

Details Dark energy with polytropic equation of state Dark energy with polytropic equation of state

2005-10-19

arxiv.org/abs/astro-ph/0510550v1

Mod.Phys.Lett.A23:3187-3198,2008

Astronomy and Astrophysics

Astrophysics

Latex, 6 pages

Scientific paper

10.1142/S0217732308028533

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.

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