  In this work, we have extended the analysis on the generalized Chaplygin gas
(GCG) model as the unification of dark energy and dark matter. Specifically, we
have shown that the model of our consideration known as the new generalized
Chaplygin gas (NGCG) model, admits a scalar field description, which means that
there exist a minimally coupled scalar field for a given scalar field potential
where the equation of state is that of the NGCG. With the use of the later
property we can construct the slow-roll parameters and derive the corresponding
values for the spectral indices for the tensor to scalar perturbation and for
the density perturbations. We have also studied the growth rate of matter
perturbations in the NGCG scenario. Finally, we have studied the viability of
the generalized second law of thermodynamics by assuming that the dynamical
apparent horizon in a NGCG universe is endowed with Hawking temperature and
Bekenstein entropy.
