  Modified Chaplygin gas as an exotic fluid has been introduced in [34].
Essential features of the modified Chaplygin gas as a cosmological model are
discussed. Observational constraints on the parameters of the model have been
included. The relationship between the modified Chaplygin gas and a homogeneous
minimally coupled scalar field are reevaluated by constructing its
self-interacting potential. In addition, we study the role of the tachyonic
field in the modified Chaplygin gas cosmological model and the mapping between
scalar field and tachyonic field is also considered.
