Gravitational form factors in the axial sector from an AdS/QCD model

We calculate the stress tensor, or energy-momentum tensor, form factors of the pion and of axial-vector mesons in the chiral limit of a hard-wall AdS/conformal-field-theory model of QCD. One (of the two) pion gravitational form factors is directly related to the second moment of the pion generalized parton distribution, thus providing a sum rule for the latter. As was also the case for vector mesons, both the pion and the axial-vector mesons appear strikingly more compact measured by the gravitational form factor than by the electromagnetic form factor.