A precise extragalactic test of General Relativity
Abstract
Einstein’s theory of gravity, General Relativity, has been precisely tested on Solar System scales, but the longrange nature of gravity is still poorly constrained. The nearby strong gravitational lens ESO 325G004 provides a laboratory to probe the weakfield regime of gravity and measure the spatial curvature generated per unit mass, γ. By reconstructing the observed light profile of the lensed arcs and the observed spatially resolved stellar kinematics with a single selfconsistent model, we conclude that γ = 0.97 ± 0.09 at 68% confidence. Our result is consistent with the prediction of 1 from General Relativity and provides a strong extragalactic constraint on the weakfield metric of gravity.
 Publication:

Science
 Pub Date:
 June 2018
 DOI:
 10.1126/science.aao2469
 arXiv:
 arXiv:1806.08300
 Bibcode:
 2018Sci...360.1342C
 Keywords:

 ASTRONOMY; PHYSICS;
 Astrophysics  Cosmology and Nongalactic Astrophysics;
 Astrophysics  Astrophysics of Galaxies;
 General Relativity and Quantum Cosmology
 EPrint:
 Published in Science. 42 pages, 10 figures including supplementary text and figures