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Epoch Dependent Dark Energy

We present a model in which the equation of state parameter w approaches -1 near a particular value of z, and has significant negative values in a restricted range of z. For example, one can have w ~ -1 near z = 1, and w > -0.2 from z = 0 to z = 0.3, and for z > 9. The ingredients of the model are neutral fermions (which may be neutrinos, neutralinos, etc) which are very weakly coupled to a light scalar field. This model emphasises the importance of the proposed studies of the properties of dark energy into the region z > 1.

preprint2009arXivOpen access
B. H. J. McKellarT. GoldmanG. J. Stephenson, Jr.P. M. Alsing
astro-ph.COhep-phnucl-th
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B. H. J. McKellarT. GoldmanG. J. Stephenson, Jr.P. M. Alsing

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