  In contrast to the electromagnetic form factors of the nucleon and nuclei
that have been extensively studied in electron scattering, there is no known
way to directly measure the gravitational form factors (GFFs), the off-forward
hadronic matrix element of the QCD energy-momentum tensor. I suggest exploring
the possibility to use massive gravitons in beyond the Standard Model and
General Relativity scenarios as a means to access the GFFs of the proton and
nuclei at future TeV-scale lepton-ion colliders.
