The dark energy equation of state

Abstract

We perform a study of cosmic evolution with an equation of state parameter $\omega (t)={\omega }_0+{\omega }_1(t\dot{H}/H)$ by selecting a phenomenological $\Lambda$ model of the form, $\dot{\Lambda }\sim H^3$. This simple proposition explains both linearly expanding and inflationary Universes with a single set of equations. We notice that the inflation leads to a scaling in the equation of state parameter, $\omega (t)$, and hence in equation of state. In this approach, one of its two parameters have been pin pointed and the other have been delineated. It has been possible to show a connection between dark energy and Higgs-Boson.

4 Latex pages, 3 figures, To appear in Mon. Not. R. Astron. Soc. Lett

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