Strong lensing constraints on modified gravity models
arXiv:1812.04765 · doi:10.1103/PhysRevD.98.124027
Abstract
We impose the first strong-lensing constraints on a wide class of modified gravity models where an extra field that modifies gravity also couples to photons (either directly or indirectly through a coupling with baryons) and thus modifies lensing. We use the nonsingular isothermal ellipsoid (NIE) profile as an effective potential, which produces flat galactic rotation curves. If a concrete modified gravity model gives a flat rotation curve, then the parameter that characterizes the lensing effect must take some definite value. We find that at , consistent with general relativity (). This constrains the parameter space in some recently proposed models.
5 pages, 4 figures
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