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Cosmographic degeneracy

Title
Cosmographic degeneracy
Authors
Shafieloo A.Linder E.V.
Ewha Authors
Eric V. Linder
Issue Date
2011
Journal Title
Physical Review D - Particles, Fields, Gravitation and Cosmology
ISSN
1550-7998JCR Link
Citation
vol. 84, no. 6
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
We examine the dark energy and matter densities allowed by precision measurements of distances out to various redshifts, in the presence of spatial curvature and (near) arbitrary behavior of the dark energy equation of state. Degeneracies among the parameters permit a remarkably large variation in their values when using only distance measurements of the late-time universe and making no assumptions about the dark energy or curvature. Going beyond distance measurements to a lower limit on the growth of structure bounds the allowed region significantly but still leaves considerable freedom to match a flat Λ Cold Dark Matter model with dark energy very different from a cosmological constant. The combination of distances with Hubble parameter, gravitational lensing or other large-scale structure data is essential to determining the cosmological model robustly. © 2011 American Physical Society.
DOI
10.1103/PhysRevD.84.063519
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자연과학대학 > 물리학전공 > Journal papers
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