Document Detail


Measuring deviations from a cosmological constant: a field-space parametrization.
MedLine Citation:
PMID:  17678009     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
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.
Authors:
Robert Crittenden; Elisabetta Majerotto; Federico Piazza
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Publication Detail:
Type:  Journal Article     Date:  2007-06-21
Journal Detail:
Title:  Physical review letters     Volume:  98     ISSN:  0031-9007     ISO Abbreviation:  Phys. Rev. Lett.     Publication Date:  2007 Jun 
Date Detail:
Created Date:  2007-08-06     Completed Date:  2008-01-22     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0401141     Medline TA:  Phys Rev Lett     Country:  United States    
Other Details:
Languages:  eng     Pagination:  251301     Citation Subset:  -    
Affiliation:
Institute of Cosmology and Gravitation, University of Portsmouth, United Kingdom.
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