Measuring deviations from a cosmological constant: a field-space parametrization.
Phys Rev Lett
; 98(25): 251301, 2007 Jun 22.
Article
in En
| MEDLINE
| ID: mdl-17678009
ABSTRACT
Most parametrizations of the dark energy equation of state do not reflect realistic underlying physical models. Here we develop a relatively simple description of dark energy based on the dynamics of a scalar field which is exact in the limit that the equation of state approaches a cosmological constant, assuming some degree of smoothness of the potential. By introducing just two parameters defined in the configuration space of the field, we are able to reproduce a wide class of quintessence models. We examine the observational constraints on these models as compared to linear evolution models and show how priors in the field space translate into priors on observational parameters.
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Collection:
01-internacional
Database:
MEDLINE
Language:
En
Journal:
Phys Rev Lett
Year:
2007
Document type:
Article
Affiliation country:
United kingdom