Testing Einstein gravity with cosmic growth and expansion

Gong-Bo Zhao; Hong Li; Eric V. Linder; Kazuya Koyama; David J. Bacon; Xinmin Zhang

doi:10.1103/PhysRevD.85.123546

Testing Einstein gravity with cosmic growth and expansion

Gong-Bo Zhao, Hong Li, Eric V. Linder, Kazuya Koyama, David J. Bacon, Xinmin Zhang

Institute of Cosmology & Gravitation

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Abstract

We test Einstein gravity using cosmological observations of both expansion and structure growth, including the latest data from supernovae (Union2.1), CMB (WMAP7), weak lensing (CFHTLS) and 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 ƒ (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.

Original language	English
Journal	Physical Review D
Volume	85
DOIs	https://doi.org/10.1103/PhysRevD.85.123546
Publication status	Published - 29 Jun 2012

Keywords

astro-ph.CO
gr-qc
hep-ph

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10.1103/PhysRevD.85.123546

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The final published version of this article by Gong-Bo Ahao et al., 'Testing Einstein gravity with cosmic growth and expansion,' Phys. Rev. D 85, 123546, can be located online at https://doi.org/10.1103/PhysRevD.85.123546. © 2011 American Physical Society
Accepted author manuscript (Post-print), 183 KB

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title = "Testing Einstein gravity with cosmic growth and expansion",

abstract = "We test Einstein gravity using cosmological observations of both expansion and structure growth, including the latest data from supernovae (Union2.1), CMB (WMAP7), weak lensing (CFHTLS) and 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 Pad{\'e} approximant form for the gravity deviations accurately captures the time and scale dependence for theories like ƒ (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.",

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T1 - Testing Einstein gravity with cosmic growth and expansion

AU - Zhao, Gong-Bo

AU - Li, Hong

AU - Linder, Eric V.

AU - Koyama, Kazuya

AU - Bacon, David J.

AU - Zhang, Xinmin

N1 - 5 pages, 3 figures; Accepted to Phys. Rev. D

PY - 2012/6/29

Y1 - 2012/6/29

N2 - We test Einstein gravity using cosmological observations of both expansion and structure growth, including the latest data from supernovae (Union2.1), CMB (WMAP7), weak lensing (CFHTLS) and 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 ƒ (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.

AB - We test Einstein gravity using cosmological observations of both expansion and structure growth, including the latest data from supernovae (Union2.1), CMB (WMAP7), weak lensing (CFHTLS) and 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 ƒ (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.

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KW - hep-ph

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Testing Einstein gravity with cosmic growth and expansion

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