  The Pomeron Regge trajectory underlies the dynamics dependence of hadronic
total cross sections and diffractive reactions at high energies. The physics of
the Pomeron is closely related to the gluon distribution function and the gluon
gravitational form factor of the target hadron. In this article we examine the
scale dependence of the nonperturbative gluon distribution in the nucleon and
the pion which was derived in a previous article [Phys. Rev. D 104, 114005
(2021)] in the framework of holographic light-front QCD and the Veneziano
model. We argue that the QCD evolution of the gluon distribution function
$g(x,\mu)$ to large $\mu^2$ leads to a single scale-dependent Pomeron. The
resulting Pomeron trajectory $\alpha_P(t, \mu)$ not only depends on the
momentum transfer squared $t$, but also on the physical scale $\mu$ of the
amplitude, such as the virtuality $Q^2$ of the interacting photon in inclusive
diffractive electroproduction. This can explain not only the $Q^2$ evolution of
the proton structure function $F_2(x,Q^2)$ at small $x$, but also the observed
energy and $Q^2$ dependence of high energy diffractive processes involving
virtual photons up to LHC energies.
