TY - UNPB

T1 - KiDS+2dFLenS+GAMA: Testing the cosmological model with the $E_{\rm G}$ statistic

AU - Amon, A.

AU - Blake, C.

AU - Heymans, C.

AU - Leonard, C. D.

AU - Asgari, M.

AU - Bilicki, M.

AU - Choi, A.

AU - Erben, T.

AU - Glazebrook, K.

AU - Harnois-Deraps, J.

AU - Hildebrandt, H.

AU - Hoekstra, H.

AU - Joachimi, B.

AU - Joudaki, S.

AU - Kuijken, K.

AU - Lidman, C.

AU - Parkinson, D.

AU - Valentijn, E. A.

AU - Wolf, C.

PY - 2017/11/30

Y1 - 2017/11/30

N2 - We present a new measurement of $E_{\rm G}$, which combines measurements
of weak gravitational lensing, galaxy clustering and redshift space
distortions. This statistic was proposed as a consistency test of
General Relativity (GR) that is insensitive to linear, deterministic
galaxy bias and the matter clustering amplitude. We combine deep imaging
data from KiDS with overlapping spectroscopy from 2dFLenS, BOSS DR12 and
GAMA and find $E_{\rm G}(z = 0.27) = 0.43\pm0.13$ (GAMA), $E_{\rm G}(z =
0.31) = 0.27\pm0.08$ (LOWZ+2dFLOZ) and $E_{\rm G}(z = 0.55) =
0.26\pm0.07$ (CMASS+2dFHIZ). We demonstrate that the existing tension in
the value of the matter density parameter hinders the robustness of this
statistic as solely a test of GR. We find that our $E_{\rm G}$
measurements, as well as existing ones in the literature, favour a lower
matter density cosmology than the Cosmic Microwave Background. For a
flat {\Lambda}CDM Universe, we find $\Omega_{\rm m}(z = 0) =
0.25\pm0.03$. With this paper we publicly release the 2dFLenS dataset
at: http://2dflens.swin.edu.au.

AB - We present a new measurement of $E_{\rm G}$, which combines measurements
of weak gravitational lensing, galaxy clustering and redshift space
distortions. This statistic was proposed as a consistency test of
General Relativity (GR) that is insensitive to linear, deterministic
galaxy bias and the matter clustering amplitude. We combine deep imaging
data from KiDS with overlapping spectroscopy from 2dFLenS, BOSS DR12 and
GAMA and find $E_{\rm G}(z = 0.27) = 0.43\pm0.13$ (GAMA), $E_{\rm G}(z =
0.31) = 0.27\pm0.08$ (LOWZ+2dFLOZ) and $E_{\rm G}(z = 0.55) =
0.26\pm0.07$ (CMASS+2dFHIZ). We demonstrate that the existing tension in
the value of the matter density parameter hinders the robustness of this
statistic as solely a test of GR. We find that our $E_{\rm G}$
measurements, as well as existing ones in the literature, favour a lower
matter density cosmology than the Cosmic Microwave Background. For a
flat {\Lambda}CDM Universe, we find $\Omega_{\rm m}(z = 0) =
0.25\pm0.03$. With this paper we publicly release the 2dFLenS dataset
at: http://2dflens.swin.edu.au.

KW - Astrophysics - Cosmology and Nongalactic Astrophysics

M3 - Working paper

BT - KiDS+2dFLenS+GAMA: Testing the cosmological model with the $E_{\rm G}$ statistic

PB - ArXiv

ER -