We investigate the gravitational form factors (GFFs) and the longitudinal
momentum densities (p+ densities) for proton in a light-front quark-diquark
model. The light-front wave functions are constructed from the soft-wall
AdS/QCD prediction. The contributions from both the scalar and the axial vector
diquarks are considered here. The results are compared with the consequences of
a parametrization of nucleon generalized parton distributions (GPDs) in the
light of recent MRST measurements of parton distribution functions (PDFs) and a
soft-wall AdS/QCD model. The spatial distribution of angular momentum for up
and down quarks inside the nucleon has been presented. At the density level, we
illustrate different definitions of angular momentum explicitly for an up and
down quark in the light-front quark-diquark model inspired by AdS/QCD.Comment: 14 pages, 9 figures; version to appear in EPJ
