Strong gravitational lensing beyond the main lens

Strong gravitational lenses are generally modelled as if the main deflector were alone in an otherwise homogeneous Universe. However, substructures and secondary deflectors near the line of sight can have a significant impact on the observed images. Such perturbations beyond the main lens represent both a modelling challenge and an opportunity to learn about dark matter and cosmology.

This focused workshop aims to bring together the practitioners of strong lensing beyond the main lens. Its general philosophy is: few talks, much work together. The programme will thus be quite light, leaving ample room for formal and informal discussions.