Test of the Chevallier-Polarski-Linder parametrization for rapid dark energy equation of state transitions

Journal Article · Tue Jul 15 04:00:00 EDT 2008 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.78.023526· OSTI ID:21250346

Linden, Sebastian; Virey, Jean-Marc ^[1]

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1. Centre de Physique Theorique, CNRS-Luminy Case 907, F-13288 Marseille Cedex 9 (France) and Universite de Provence (France)

We test the robustness and flexibility of the Chevallier-Polarski-Linder (CPL) parametrization of the dark energy equation of state w(z)=w{sub 0}+w{sub a}(z/1+z) in recovering a four-parameter steplike fiducial model. We constrain the parameter space region of the underlying fiducial model where the CPL parametrization offers a reliable reconstruction. It turns out that non-negligible biases leak into the results for recent (z<2.5) rapid transitions, but that CPL yields a good reconstruction in all other cases. The presented analysis is performed with supernova Ia data as forecasted for a space mission like SNAP/JDEM, combined with future expectations for the cosmic microwave background shift parameter R and the baryonic acoustic oscillation parameter A.

• OSTI ID: 21250346
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 2 Vol. 78; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYONS
EQUATIONS OF STATE
FLEXIBILITY
NONLUMINOUS MATTER
OSCILLATIONS
RELICT RADIATION
SPACE
SUPERNOVAE