Universe With w < − 1 Without Big Smash
نویسنده
چکیده
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
منابع مشابه
Future 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. PACS Number: 98.80.Cq. accelerated universe. Experimental probes, during last few years suggest that the present universe is spatially flat as well as it is dominated by yet unkno...
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متن کاملar X iv : a st ro - p h / 04 07 04 8 v 4 3 0 M ay 2 00 5 Future universe with w < − 1 Without Big Smash
It is demonstrated that if cosmic dark energy behaves like a fluid with equation of state p = wρ (p and ρ being pressure and energy density respectively) as well as generalized Chaplygin gas simultaneously, Big Rip or Big Smash problem does not arise even for equation of state parameter w < −1. Unlike other phantom models, here, the scale factor for the future universe is found regular for all ...
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Recent observations suggest that the cosmological equation-of-state parameter w is close to−1. To say this is to imply thatw could be slightly less than−1, which leads to R.Caldwell’s “phantom cosmologies”. These often have the property that they end in a “Big Smash”, a final singularity in which the Universe is destroyed in a finite proper time by excessive expansion. We show that, classically...
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Recent observations suggest that the cosmological equation-of-state parameter w is close to−1. To say this is to imply thatw could be slightly less than−1, which leads to R.Caldwell’s “Phantom cosmologies”. These often have the property that they end in a “Big Smash”, a final singularity in which the Universe is destroyed in a finite proper time by excessive expansion. We show that, classically...
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