Search Publications

Constraint on the post-Newtonian parameter γ on galactic size scales

Bolton, Adam S.; Burles, Scott; Rappaport, Saul

We constrain the post-Newtonian gravity parameter γ on kiloparsec scales by comparing the masses of 15 elliptical lensing galaxies from the Sloan Lens ACS Survey as determined in two independent ways. The first method assumes only that Newtonian gravity is correct and is independent of γ, while the second uses gravitational lensing which depends o…

Hubble imaging excludes cosmic string lens

Hogan, Craig J.; Agol, Eric; Plotkin, Richard M.

The galaxy image pair Capodimonte-Sternberg-Lens Candidate no. 1 (CSL-1) has been a leading candidate for a cosmic string lens. High quality imaging data from the Hubble Space Telescope presented here show that it is not a lens but a pair of galaxies. The galaxies show different orientations of their principal axes, not consistent with any lens mo…