  This work is aimed to explore the dark dynamical effects of $f(R,T)$ modified
gravity theory on the dynamics of compact celestial star. We have taken the
interior geometry as spherical star which is filled with imperfect fluid
distribution. The modified field equations are explored by taking a particular
form of $f(R,T)$ model, i.e., $f(R,T)=f_1(R)+f_2(R)f_3(T)$. These equations are
then utilized to formulate the well-known structure scalars under the dark
dynamical effects of this higher order gravity theory. Also, the evolution
equations for expansion and shear are formulated with the help of these scalar
variables. Further, all this analysis have been made under the condition of
constant $R$ and $T$. We found a crucial significance of dark source terms and
dynamical variables on the evolution and density inhomogeneity of compact
objects.
