  The recently proposed aether scalar tensor (AeST) model reproduces both the
successes of particle dark matter on cosmological scales and those of modified
Newtonian dynamics (MOND) on galactic scales. But the AeST model reproduces
MOND only up to a certain maximum galactocentric radius. Since MOND is known to
fit very well to observations at these scales, this raises the question of
whether the AeST model comes into tension with data. We tested whether or not
the AeST model is in conflict with observations using a recent analysis of data
for weak gravitational lensing. We solved the equations of motion of the AeST
model, analyzed the solutions' behavior, and compared the results to
observational data. The AeST model shows some deviations from MOND at the radii
probed by weak gravitational lensing. The data show no clear indication of
these predicted deviations.
