Dark energy with polytropic equation of state

Abstract

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.

Latex, 6 pages

References in corpus (2)

• Evolution of dark-matter haloes in a variety of dark-energy cosmologies
• Searching for a Solution to the Age Problem of the Universe

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