  Collective modes of an anisotropic hot QCD medium have been studied within
the semi-classical transport theory employing Bhatnagar-Gross-Krook (BGK)
collisional kernel. The modeling of the isotropic medium is primarily based on
a recent quasi-particle description of hot QCD equation of state where the
medium effects have been encoded in effective gluon and quark/anti-quark
momentum distributions that posses non-trivial energy dispersions. The
anisotropic distribution functions are obtained in a straightforward the way by
stretching or squeezing the isotropic ones along one of the directions. The
gluon self-energy is computed using these distribution functions in a
linearized transport equation with Bhatnagar-Gross-Krook (BGK) collisional
kernel. Further, the tensor decomposition of gluon self-energy leads to the
structure functions which eventually controls the dispersion relations and the
collective mode structure of the medium. It has been seen that both the medium
effects and collisions induce appreciable modifications to the collective modes
and plasma excitations in the hot QCD medium.
