Universe With w < − 1 Without Big Smash

Here, it is proposed that if dark energy behaves like a perfect fluid as well as Chaplygin gas simultaneously, Big Rip or Big Smash type situation, for the future universe, can be avoided for equation of state w < −1. Experimental probes, during last few years suggest that the present universe is spatially flat as well as it is dominated by yet unknown form of dark energy [1,2]. Moreover, studies of Ia supernova [3,4] and WAMP [5,6] show accelerated expansion of the present universe such thatä > 0 with a(t) being the scale factor of the Friedmann Robertson Walker line-element dS 2 = dt 2 − a 2 (t)[dx 2 + dy 2 + dz 2 ]. (1) Theoretically accelerated expansion of the universe is obtained when the cosmological model is supposed to be dominated by a fluid obeying the equa