Blake, C;
Amon, A;
Asgari, M;
Bilicki, M;
Dvornik, A;
Erben, T;
Giblin, B;
... Wright, AH; + view all
(2020)
Testing gravity using galaxy-galaxy lensing and clustering amplitudes in KiDS-1000, BOSS, and 2dFLenS.
Astronomy & Astrophysics
, 642
, Article A158. 10.1051/0004-6361/202038505.
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Abstract
The physics of gravity on cosmological scales affects both the rate of assembly of large-scale structure and the gravitational lensing of background light through this cosmic web. By comparing the amplitude of these different observational signatures, we can construct tests that can distinguish general relativity from its potential modifications. We used the latest weak gravitational lensing dataset from the Kilo-Degree Survey, KiDS-1000, in conjunction with overlapping galaxy spectroscopic redshift surveys, BOSS and 2dFLenS, to perform the most precise existing amplitude-ratio test. We measured the associated E_{G} statistic with 15 - 20% errors in five Δz = 0.1 tomographic redshift bins in the range 0.2 < z < 0.7 on projected scales up to 100 h^{-1} Mpc. The scale-independence and redshift-dependence of these measurements are consistent with the theoretical expectation of general relativity in a Universe with matter density Ω_{m} = 0.27 ± 0.04. We demonstrate that our results are robust against different analysis choices, including schemes for correcting the effects of source photometric redshift errors, and we compare the performance of angular and projected galaxy-galaxy lensing statistics.
| Type: | Article |
|---|---|
| Title: | Testing gravity using galaxy-galaxy lensing and clustering amplitudes in KiDS-1000, BOSS, and 2dFLenS |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1051/0004-6361/202038505 |
| Publisher version: | https://doi.org/10.1051/0004-6361/202038505 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher's terms and conditions. |
| Keywords: | dark energy, large-scale structure of Universe, gravitational lensing: weak, surveys |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10114463 |
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