In order to account for the observed cosmic acceleration,a modiGcation of the ansatz for the variation of density in Friedman-Robertson-Walker(FRW)FRW models given by Islam is proposed.The modified ansatz leads to an ...In order to account for the observed cosmic acceleration,a modiGcation of the ansatz for the variation of density in Friedman-Robertson-Walker(FRW)FRW models given by Islam is proposed.The modified ansatz leads to an equation of state which corresponds to that of a variable Chaplygin gas,which in the course of evolution reduces to that of a modified generalized Chaplygin gas(MGCG)and a Chaplygin gas(CG),exhibiting late-time acceleration.展开更多
文摘In order to account for the observed cosmic acceleration,a modiGcation of the ansatz for the variation of density in Friedman-Robertson-Walker(FRW)FRW models given by Islam is proposed.The modified ansatz leads to an equation of state which corresponds to that of a variable Chaplygin gas,which in the course of evolution reduces to that of a modified generalized Chaplygin gas(MGCG)and a Chaplygin gas(CG),exhibiting late-time acceleration.
