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We study the imprints that theories of gravity beyond GR can leave on thelensing signal around line of sight directions that are predominantlyhalo-underdense (called troughs) and halo-overdense. To carry out ourinvestigations, we consider the normal branch of DGP gravity, as well as aphenomenological variant thereof that directly modifies the lensing potential.The predictions of these models are obtained with N-body simulation andray-tracing methods using the ECOSMOG and Ray-Ramses codes. We analyse thestacked lensing convergence profiles around the underdense and overdense linesof sight, which exhibit, respectively, a suppression and a boost w.r.t. themean in the field of view. The modifications to gravity in these modelsstrengthen the signal w.r.t. $\Lambda{\rm CDM}$ in a scale-independent way. Wefind that the size of this effect is the same for both underdense and overdenselines of sight, which implies that the density field along the overdensedirections on the sky is not sufficiently evolved to trigger the suppressioneffects of the screening mechanism. These results are robust to variations inthe minimum halo mass and redshift ranges used to identify the lines of sight,as well as to different line of sight aperture sizes and criteria for theirunderdensity and overdensity thresholds.

Weak lensing by galaxy troughs with modified gravity