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Dark Energy Models in the w - w' Plane | | Robert J. Scherrer
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29 Sep 2005 | | Subject: | astro-ph gr-qc hep-th | | Abstract: | We examine the behavior of dark energy models in the plane defined by w (the equation of state parameter for the dark energy) and w’ (the derivative of w with respect to the logarithm of the scale factor). For non-phantom barotropic fluids with positive squared sound speed, we find that w’ < 3w(w+1), the opposite of the bound on quintessence models previously derived by Caldwell and Linder. Thus, these barotropic models and quintessence models for the dark energy occupy disjoint regions in the w - w’ plane. We also derive two new bounds for quintessence models in the w - w’ plane: the first is a general bound for any scalar field with a monotonic potential, while the second improves on the Caldwell-Linder bound for tracker quintessence models. Observationally distinguishing barotropic models from quintessence models requires sigma(w’) < 1+w. | | Source: | arXiv, astro-ph/0509890 | | Services: | Forum | Review | PDF | Favorites | |
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