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Modifications to GR generically predict time and scale-dependent effectswhich may be probed by observations of strong lensing by galaxies. Measurementsof the stellar velocity dispersion determine the dynamical mass whereasmeasurements of the Einstein radius determine the lensing mass. In GR these twomasses are equal; in alternative gravity theories they may not be. Usingmeasurements of the stellar velocity dispersion and strong lensing aroundgalaxies from the Sloan Lens ACS (SLACS) survey we place constraints on lensingin modified gravity theories and extend previous studies by applying this datato explore its dependence on various properties of the lens such as the lensredshift or mass and thereby constrain scalar-tensor, f(R) gravity theories,and generic parameterizations of deviations from GR. Besides applying theobservations to these specific gravity theories, the data places a constrainton a generic dependence of modifications to GR on the lens mass and redshift.At the 68% confidence level we find that the ratio between the lensing anddynamical masses can only vary by less then 50% over a mass range for the lensgalaxies of 1E12 < M/Msun < 1E14 and less than 40% over the redshift range 0.06< z < 0.36.

Testing gravity on kiloparsec scales with strong gravitational lenses