arXiv:0908.0969·v1·High Energy Physics — Phenomenology
Epoch Dependent Dark Energy
B. H. J. McKellar (1) · T. Goldman (2) · G. J. Stephenson · Jr. (3) · P. M. Alsing (3) ((1) University of Melbourne · (2) Los Alamos National Laboratory · (3) University of New Mexico)
Abstract
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.
Comments: 7pp., 2 figs. Invited talk at the 5th Int'l. Wkshp. on the Dark Side of the Universe, 1-5 June 2009 Melbourne, DSU09; to appear in the proceedings