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Testing Einstein gravity with cosmic growth and expansion

Title
Testing Einstein gravity with cosmic growth and expansion
Authors
Zhao G.-B.Li H.Linder E.V.Koyama K.Bacon D.J.Zhang X.
Ewha Authors
Eric V. Linder
Issue Date
2012
Journal Title
Physical Review D - Particles, Fields, Gravitation and Cosmology
ISSN
1550-7998JCR Link
Citation
vol. 85, no. 12
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
We test Einstein gravity using cosmological observations of both expansion and structure growth, including the latest data from supernovae (Union2.1), cosmic microwave background (WMAP7), weak lensing (CFHTLS) and the peculiar velocity of galaxies (WiggleZ). We fit modified gravity parameters of the generalized Poisson equations simultaneously with the effective equation of state for the background evolution, exploring the covariances and model dependence. The results show that general relativity is a good fit to the combined data. Using a Padé approximant form for the gravity deviations accurately captures the time and scale dependence for theories like f(R) and DGP gravity, and weights high and low redshift probes fairly. For current observations, cosmic growth and expansion can be fit simultaneously with little degradation in accuracy, while removing the possibility of bias from holding one aspect fixed. © 2012 American Physical Society.
DOI
10.1103/PhysRevD.85.123546
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자연과학대학 > 물리학전공 > Journal papers
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