Duality extended Chaplygin cosmologies with a big rip

摘要: We consider modifications to the Friedmann equation motivated by recent proposals along these lines pursuing an explanation observed late time acceleration. Here we show those can be framed within a theory with self-interacting gravity, where term self-interaction refers here presence of functions $\rho$ and $p$ in right hand side Einstein equations. then discuss construction duals cosmologies generated that framework. After investigate required generate generalized modified Chaplygin their belong larger family call extended cosmologies. Finally, letting parameters models take values not earlier considered literature some representatives display sudden future singularities, which indicates behavior is rather different from or gas This reinforces idea gravity responsible for unexpected evolutionary features universe.