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We study cosmic voids in the normal-branch Dvali-Gabadadze-Porrati (nDGP)braneworld models, which are representative of a class of modified gravitytheories where deviations from General Relativity are usually hidden by theVainshtein screening in high-density environments. This screening is lessefficient away from these environments, which makes voids ideally suited fortesting this class of models. We use N-body simulations of $\Lambda$-cold darkmatter ($\Lambda$CDM) and nGDP universes, where dark matter haloes arepopulated with mock galaxies that mimic the clustering and number densities ofthe BOSS CMASS galaxy sample. We measure the force, density and weak lensingprofiles around voids identified with six different algorithms. Compared to$\Lambda$CDM, voids in nDGP are more under-dense due to the action of the fifthforce that arises in these models, which leads to a faster evacuation of matterfrom voids. This leaves an imprint on the weak lensing tangential shear profilearound nDGP voids, an effect that is particularly strong for 2D underdensitiesthat are identified in the plane-of-the-sky. We make predictions for thefeasibility of distinguishing between nDGP and $\Lambda$CDM using void lensingin upcoming large-scale surveys such as LSST and Euclid. We compare with theanalysis of voids in chameleon gravity theories and find that the weak lensingsignal for 3D voids is similar to nDGP, whereas for 2D voids the differenceswith $\Lambda$CDM are much stronger for the chameleon gravity case, a directconsequence of the different screening mechanisms operating in these theories.

The Santiago-Harvard-Edinburgh-Durham void comparison II: unveiling the Vainshtein screening using weak lensing