Developed Chaplygin gas equation of state and its relation with the string theory

In this paper we review several kinds of Chaplygin gas as a model of dark energy and introduce developed Chaplygin gas which is unification of all previous models. Dark energy considered as fluid of many body system with specific equation of state. We show, as a main goal of this paper that developed Chaplygin gas equation of state can be obtained from string theory like ordinary Chaplygin gas equation of state. We write string Hamiltonian and obtain equation of motion. Then compare it with Euler equation in fluid mechanics which yields to a differential equation. Solving this differential equation give us developed Chaplygin gas equation of state.