Epoch Dependent Dark Energy
B. H. J. McKellar (1), T. Goldman (2), G. J. Stephenson, Jr. (3) and, P. M. Alsing (3) ((1) University of Melbourne, (2) Los Alamos National, Laboratory, (3) University of New Mexico)
TL;DR
This paper proposes a model where dark energy's equation of state varies significantly with redshift, highlighting the importance of studying dark energy properties at high redshifts beyond z > 1.
Contribution
The model introduces a redshift-dependent dark energy equation of state involving weakly coupled neutral fermions and a light scalar field, emphasizing the significance of high-redshift observations.
Findings
w approaches -1 near z=1
w remains > -0.2 for 0<z<0.3
w varies significantly at z>9
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.
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