TY - JOUR
T1 - The WiggleZ Dark Energy Survey
T2 - constraining the evolution of Newton's constant using the growth rate of structure
AU - Nesseris, Savvas
AU - Davis, Tamara Maree
AU - Blake, Chris
AU - Parkinson, David
PY - 2011/7
Y1 - 2011/7
N2 - We constrain the evolution of Newton's constant using the growth rate of large-scale structure measured by the WiggleZ Dark Energy Survey in the redshift range 0.1 < z < 0.9. We use this data in two ways. Firstly we constrain the matter density of the Universe, Ωm (assuming General Relativity), and use this to construct a diagnostic to detect the presence of an evolving Newton's constant. Secondly we directly measure the evolution of Newton's constant, Geff, that appears in Modified Gravity theories, without assuming General Relativity to be true. The novelty of these approaches are that, contrary to other methods, they do not require knowledge of the expansion history of the Universe, H(z), making them model independent tests. Our constraints for the second derivative of Newton's constant at the present day, assuming it is slowly evolving as suggested by Big Bang Nucleosynthesis constraints, using the WiggleZ data is G̈eff(t0) = -1.19 ± 0.95·10-20h2yr-2, where h is defined via H0 = 100hkms-1Mpc-1, while using both the WiggleZ and the Sloan Digital Sky Survey Luminous Red Galaxy (SDSS LRG) data is eff(t0) = -3.6 ± 6.8·10-21h2yr-2, both being consistent with General Relativity. Finally, our constraint for the rms mass fluctuation σ8 using the WiggleZ data is σ8 = 0.75 ± 0.08, while using both the WiggleZ and the SDSS LRG data σ8 = 0.77 ± 0.07, both in good agreement with the latest measurements from the Cosmic Microwave Background radiation.
AB - We constrain the evolution of Newton's constant using the growth rate of large-scale structure measured by the WiggleZ Dark Energy Survey in the redshift range 0.1 < z < 0.9. We use this data in two ways. Firstly we constrain the matter density of the Universe, Ωm (assuming General Relativity), and use this to construct a diagnostic to detect the presence of an evolving Newton's constant. Secondly we directly measure the evolution of Newton's constant, Geff, that appears in Modified Gravity theories, without assuming General Relativity to be true. The novelty of these approaches are that, contrary to other methods, they do not require knowledge of the expansion history of the Universe, H(z), making them model independent tests. Our constraints for the second derivative of Newton's constant at the present day, assuming it is slowly evolving as suggested by Big Bang Nucleosynthesis constraints, using the WiggleZ data is G̈eff(t0) = -1.19 ± 0.95·10-20h2yr-2, where h is defined via H0 = 100hkms-1Mpc-1, while using both the WiggleZ and the Sloan Digital Sky Survey Luminous Red Galaxy (SDSS LRG) data is eff(t0) = -3.6 ± 6.8·10-21h2yr-2, both being consistent with General Relativity. Finally, our constraint for the rms mass fluctuation σ8 using the WiggleZ data is σ8 = 0.75 ± 0.08, while using both the WiggleZ and the SDSS LRG data σ8 = 0.77 ± 0.07, both in good agreement with the latest measurements from the Cosmic Microwave Background radiation.
U2 - 10.1088/1475-7516/2011/07/037
DO - 10.1088/1475-7516/2011/07/037
M3 - Journal article
SN - 1475-7516
VL - 2011
SP - 037
JO - Journal of Cosmology and Astroparticle Physics
JF - Journal of Cosmology and Astroparticle Physics
IS - 07
ER -