A new equation of state for dark energy
Abstract
In the contemporary Cosmology, dark energy is modeled as a perfect fluid, having a very simple equation of state: pressure is proportional to dark energy density. As an alternative, I propose a more complex equation of state, with pressure being function of three variables: dark energy density, matter density and the size of the Universe. One consequence of the new equation is that, in the late-time Universe, cosmological scale factor is linear function of time; while the standard cosmology predicts an exponential function.The new equation of state allows attributing a temperature to the physical vacuum, a temperature proportional to the acceleration of the expansion of the Universe. The vacuum temperature decreases with the expansion of the Universe, approaching (but never reaching) the absolute zero.
Keywords
Cite
@article{arxiv.0711.0439,
title = {A new equation of state for dark energy},
author = {Dragan Slavkov Hajdukovic},
journal= {arXiv preprint arXiv:0711.0439},
year = {2009}
}
Comments
Improved version; submitted to Physics Letters B