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24 April 2024 |
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Testing gravity on large scales by combining weak lensing with galaxy clustering using CFHTLenS and BOSS CMASS | | Shadab Alam
; Hironao Miyatake
; Surhud More
; Shirley Ho
; Rachel Mandelbaum
; | | Date: |
28 Oct 2016 | | Abstract: | We measure a combination of gravitational lensing, galaxy clustering, and
redshift-space distortions called $E_G$. The quantity $E_G$ probes both parts
of metric potential and is insensitive to galaxy bias and $sigma_8$. These
properties make it an attractive statistic to test $Lambda$CDM, General
Relativity and its alternate theories. We have combined CMASS DR11 with
CFHTLenS and recent measurements of $eta$ from RSD analysis, and find $E_G(z
= 0.57) = 0.42 pm 0.056$, an 13\% measurement in agreement with the prediction
of general relativity $E_G(z = 0.57) = 0.396 pm 0.011$ using the Planck 2015
cosmological parameters. We have corrected our measurement for various
observational and theoretical systematics. Our measurement is consistent with
the first measurement of $E_G$ using CMB lensing in place of galaxy lensing
(Pullen et. al. 2015a) at small scales, but shows 2.8$sigma$ tension when
compared with their final results including large scales. This analysis with
future surveys will provide improved statistical error and better control over
systematics to test General Relativity and its alternate theories. | | Source: | arXiv, 1610.9410 | | Services: | Forum | Review | PDF | Favorites | |
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